inflearn logo
Challenge
In progress

[Inflearn Challenge] Sherlock Sang-bae ㅡ Study for 30 minutes a day, collect clues, and reveal the culprit!

There has never been a learning challenge like this before. An immersive challenge combining storytelling and study habits! Collect clues to find the culprit by attending 30-minute lectures every day for 3 weeks. Solve the cold case that occurred at Inflearn together and even take home a prize 🕵️‍♂️🔎

789명이 수강한

강의로 진행되는 챌린지!

Inflearn Monthly Challenge

302명 참가자들의 미션을
직접 확인할 수 있어요! 🔥

참여자가 많을수록
늘어나는 우승 상금!

7개 수업 학습

15회 미션 수행

라이브 2 회

신청만 해도 26% 쿠폰 제공해요.

나 혼자가 아닌 여럿이 공부해요!

범인 정답 보상으로 현금을 드립니다.

하루에 30분씩 공부 습관을 길러요.

inflearn님과 함께해요!

Inflearn Verified

731,130

Learners

8,232

Reviews

118

Answers

4.8

Rating

159

Courses

I believe that opportunities for learning should be free from economic and physical limitations.
We pursue equality in opportunities for growth.

탐정 상배

INFLEARN JUNE CHALLENGE 2026
26%Discount Coupon

🔍 3-Week Learning Mystery Gather clues and
reveal the culprit

🔍 Daily Learning Verification  ·  Collect Clues  ·  Identify the Culprit  ·  3-Week Completion Challenge  ·  Maximum Cash Refund  ·  Omnibus Trilogy  ·  Sangbae Detective Agency  ·  🔍 Daily Learning Verification  ·  Collect Clues  ·  Identify the Culprit  ·  3-Week Completion Challenge  ·  Maximum Cash Refund  ·  Omnibus Trilogy  ·  Sangbae Detective Agency  · 
Case File

Omnibus Trilogy Mystery

A new case breaks out every week.
Gather clues for 7 days and identify the culprit for each week.


Chapter 01 · Week 1 6/1–6/7
Catch the Thief 🥷🏻
At the Inflearn office at dawn, someone stole the most important thing.

Chapter 02 · Week 2 6/8–6/14
The Great Inflab Blackout 💡
"On a peaceful Monday afternoon, during CTO Hyang-ro's presentation, all the lights in the office go out. Inflab is paralyzed for a week."

Chapter 03 · Week 3 6/15–6/21
To Be Continued...
"Detective, the case file hasn't arrived. Is it really going to end like this?"

* Chapter contents and schedules are subject to change depending on operational circumstances.

Investigation Procedure

This is how it works

Only those who submit every single mission will be able to identify the culprit.

1
Study for 30 minutes every day and submit your verification.
Regardless of the field — development, design, job hunting, and self-improvement are all OK. Other platforms are also fine.
(Duolingo, Udemy, and Fast Campus are all welcome. 🤗)
2
Submit Mission → Receive 1 Clue
Upon submitting a mission, one physical characteristic of the culprit will be provided as a clue.
You must collect all six to be able to identify the culprit on the 7th day.
3
Write Today's Journal (Recommended)
Write freely about your daily life.
The culprit will incorporate the contents of your journal into the world-building and deliver a story message via comments.
4
Every 7th day mission: Identify the culprit.
Describe the culprit's appearance using the clues you've gathered and identify the culprit.
The correct answer will be revealed through Inflearn News after the episode ends.
Clue System

Identify the culprit with 6 clues

If you submit the mission every day, the culprit's characteristics will be revealed one by one.
If there are not enough clues, it is virtually impossible to identify the culprit.

Example
👁Wearing glasses
🎨Hair Color
Mole/Features
👔Clothing style
📏Height/Body Type
🔎Crucial Clue

* Actual clues vary by episode.

Mystery Universe

My daily life becomes a mystery novel

When you write about your day in the journal,
the culprit will weave those details into the world to send a personalized message just for you.

🙋
My Learning Log
I solved 3 algorithm problems at a cafe today. I couldn't solve one of them in the end...
🥷🏻
The culprit's reply
That problem you couldn't solve at the cafe... I know the answer. Will you be at the same spot tomorrow as well?

💡 If the content of your journal changes, the culprit's reply will also change. Your day itself becomes the material for a mystery novel.


Reward

Rewards you receive according to your hard work

From application to completion, benefits accumulate at every step.

🎟  Just by applying
26% discount coupon
Automatically issued immediately upon application
Can be used when purchasing Inflearn courses

🎙  라이브 참여만 해도 LIVE BONUS
Up to 3,000pt
Just by attending the live session,
points will pour in 🎁
💰  Completion + Catching the Culprit — Cash Refund
3,000 KRW
Complete Chapter 1
+ Correctly identify 1 culprit

6,000 won
Complete 2 chapters
+ Correctly identify 2 culprits

9,000 KRW + ⍺
Completed 3 chapters
+ correctly identified all culprits
(Additional distribution of 1/n of the remaining prize money
among those who completed 1–2 chapters)
🏆  Special Awards
MVP Immersive Participant 🕵️
Inflearn Official Short-Sleeve Goods
3 most passionate participants
Diligent Honorable Mention 📚
5,000 points
10 diligent participants who narrowly missed out

Exclusive benefits for challenge applicants
✨ Beta early access for challenge applicants
Challenge-exclusive benefits
Inflearn AI Learning Agent
Be the first to meet Inflearn's unique AI learning agent that understands lectures, talks with you, and teaches you in your own way.
🎬
Conversation based on lecture context
It understands the timeline of the video currently playing and provides answers. You can ask things like, "Explain the concept that just came up again."
🧠
AI that remembers me
The more we converse, the more it understands my learning style and interests, providing answers that are increasingly tailored to me.
🎭
Choose from 7 characters
From a friendly friend-like tone to a cold-headed mentor, you can talk to an AI in any style you want.
💬
Start immediately with recommended questions
"Summarize the lesson," "Give me a real-world example," "Create practice problems" — you can use these immediately with just one click.
800 turns for 30 days provided — This is enough to fully address your daily learning questions throughout the challenge period. — đây là số lượng đủ để bạn có thể giải đáp mọi thắc mắc học tập mỗi ngày trong suốt thời gian diễn ra thử thách.
Participant Reviews

Stories from students who joined us

Over 3,000+ students have participated in Inflearn Challenges.
Let's enjoy the challenge together without any pressure!

96.1 points
Overall Average Satisfaction
Based on 5 challenges
4.80/5
Average Rating
Weighted Average of Reviews
245
Total number of reviews
Total for all challenges
3,063
Total Students
Total for all challenges combined


"Thanks to the pleasant pressure of set times and goals, I was able to head to the library or a cafe every day with the mindset of 'just a little more,' even in moments when I felt tired or exhausted."
2026 Let's Run to the End Completion Challenge · ★★★★★
"Thanks to this challenge, I was able to achieve the first goal I set for 2026. Each day was fulfilling and fun. Thank you for the great challenge :)"
2026 Let's Run Completion Challenge · ★★★★★
"I started this because I wanted to make reviewing a habit, and after 21 days, it has actually become a routine. Thanks to the structure of seven sets of 'three-day resolutions,' I was able to make it to the end without feeling overwhelmed. I highly recommend it!"
March Infinite 3-Day Resolution Challenge · ★★★★★
"Even though I was incredibly busy preparing my thesis as a graduate student, I gained strength from the other participants who were consistently doing the challenge, and I was able to finish both the course and the challenge. I also got a job!"
3-Week Survival Challenge · ★★★★★
"I feel so proud just for finishing the lectures that I would still be procrastinating on if I hadn't participated in the challenge."
March Infinite Resolution Challenge · ★★★★★
"Thanks to the pleasant pressure of set times and goals, I was able to head to the library or a cafe every day with the mindset of 'let's do just a little more,' even in moments when I felt tired or exhausted."
2026 Let's Run to the End Completion Challenge · ★★★★★
"Thanks to this challenge, I was able to achieve the first goal I set for 2026. Every day was rewarding and fun. Thank you for the great challenge :)"
2026 Let's Run to the End Completion Challenge · ★★★★★
"The fact is, I actually read the major textbook that I had been hesitating to read.."
March Infinite Three-Day Resolution Challenge · ★★★★★
"I feel energized because we are walking this path together. Having colleagues by my side when I'm exhausted... I hope we can stay together until the end."
April Challenge Participant · ★★★★★
"A challenge that helps build a habit so you can do it consistently! I can't believe I'm only finding out about this now ㅠㅠ"
March Challenge Participant · ★★★★★
"Thanks to the Inflearn Challenge, I was able to record the start of 2026 in a very special way. I'm so grateful—I wonder if I've ever been this passionately immersed in something before!"
2026 Run Like a Horse Completion Challenge · ★★★★★
"Thanks to Inflearn, I was able to record the beginning of 2026 in a very special way. I wonder if there has ever been another time in my life when I was this passionately immersed in something from the very start of the new year."
2026 Let's Run Completion Challenge · ★★★★★
"The fact is, I actually read the major textbook that I had been hesitating to read.."
March Infinite Three-Day Resolution Challenge · ★★★★★
"I feel energized because we are going together. Having colleagues by my side when I'm exhausted... I hope we can make it to the end together."
April Challenge Participant · ★★★★★
Event

The prize pool grows as more people join

Participate in the event and receive benefits!
The more you spread the word about the challenge, the larger the prize money you'll receive!

EVENT #1
Invite Friends
Inflearn 3,000 Points
(To everyone who participated)
🔍 공유 방법 및 인증 링크
EVENT #2
Promote the Challenge
Hamburger Set (1 person)

🔍 공유 방법 및 인증 링크
Challenge Information

Detailed information at a glance

Duration3 weeks · 21 days
Participation Fee9,900 KRW
Number of MissionsTotal 21
Number of suspects1 person per week × 3
FieldAny field · Other platforms OK
TargetAny Inflearn user
Identify the CulpritEvery 7th day of the week
Maximum Refund9,000 KRW + ⍺

Story Preview

You can see the rest of the story by participating in the challenge.

스토리 미리보기

SANGBAE DETECTIVE AGENCY

Check out the story for yourself
in the June 1st challenge

The culprit is already by your side.
Participate in the challenge and find out for yourself.

A 26% discount coupon will be automatically issued immediately upon application.

강사 프로필
LIVE

함께 소통할 수 있는 라이브가 예정되어 있어요!

06.11.Th

AM 11:00

[6월 11일] 탐정 여러분, 챌린지 중간 현황 브리핑 드립니다. (+ 랜덤 포인트 증정)

06.25.Th

AM 11:00

[6월 25일] 수사에 참여해주신 모든 탐정님들께 감사인사드립니다. (+ 랜덤포인트 증정)

5월

31일

챌린지 시작일

2026년 5월 31일 PM 03:00

챌린지 종료일

2026년 6월 25일 PM 02:30

챌린지에서 배워요

  • Real cash 💰 — A reward will be given if you correctly identify all 3 culprits. You'll receive a reward even if you get at least 1 right.

  • A habit formed before I knew it ☝🏻 — once the incident is over, sitting at your desk won't be difficult anymore.

  • Precious Journal Records 📝 — You can hear the culprit's voice within the daily journal entries. (The culprit actually leaves comments 👤)

Recommended for
these people

Who is this course right for?

  • For those who want to get their money's worth — the structure allows you to get almost everything back if you work hard after paying 9,900 won. The harder you work, the more you gain.

  • Anyone who wants to do something consistently, regardless of the field — whether it's development, design, or job hunting. You only need to do it for 30 minutes.

  • For those who want to study but find it too boring to do alone — the challenge of receiving a comment from the "culprit" every day is more worth looking forward to than you might think.

Need to know before starting?

  • You can take any lecture or course you've wanted to listen to, regardless of the platform!

  • If you are unsure about which course to take, try using the 26% coupon we've gifted you 🎟️

Reviews

All

34 reviews

5.0

34 reviews

  • minjukang7271805님의 프로필 이미지
    minjukang7271805

    Reviews 2

    Average Rating 5.0

    5

    71% enrolled

    It's so exciting that I'm getting totally absorbed!

    • brucehan님의 프로필 이미지
      brucehan

      Reviews 92

      Average Rating 4.4

      5

      71% enrolled

      Fun challenges! Immersive challenges! Energetic challenges!

      • d2v210p님의 프로필 이미지
        d2v210p

        Reviews 82

        Average Rating 4.7

        5

        57% enrolled

        The challenge concept changed completely this time, so it's really fun!

        • inflabdora
          Instructor

          Hehe... what a relief.. Thank you 😊

      • koelkorea7927님의 프로필 이미지
        koelkorea7927

        Reviews 17

        Average Rating 5.0

        5

        71% enrolled

        This is a fresh challenge. A round of applause for the staff who must have nearly lost their hair coming up with this project.

        • inflabdora
          Instructor

          Fortunately, my head is still attached! ☺️

      • ssafy13049762님의 프로필 이미지
        ssafy13049762

        Reviews 2

        Average Rating 5.0

        5

        71% enrolled

        Inflearn challenges are the best! They help me study consistently with always new and fun challenges.

        이 강의의 지난 수강평

        FAQs

        취소 및 환불 규정
        챌린지는 지식공유자가 설정한 수업 최소 정원이 충족되지 않을 경우, 폐강 안내가 고지되며 결제 내역이 자동취소됩니다.

        inflearn's other courses

        Check out other courses by the instructor!

        $7.70