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 👤)
Starts Jun 1
Finish Jun 25
Last cohort's work
Inflearn Verified
738,439
Learners
8,742
Reviews
118
Answers
4.8
Rating
166
Courses
I believe that opportunities for learning should be free from economic and physical limitations.
We pursue equality in opportunities for growth.
A new case breaks out every week.
Gather clues for 7 days and identify the culprit for each week.
* Chapter contents and schedules are subject to change depending on operational circumstances.
Only those who submit every single mission will be able to identify the culprit.
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.
* Actual clues vary by episode.
Mystery Universe
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.
💡 If the content of your journal changes, the culprit's reply will also change. Your day itself becomes the material for a mystery novel.
From application to completion, benefits accumulate at every step.
Over 3,000+ students have participated in Inflearn Challenges.
Let's enjoy the challenge together without any pressure!
Participate in the event and receive benefits!
The more you spread the word about the challenge, the larger the prize money you'll receive!
You can see the rest of the story by participating in the challenge.
SANGBAE DETECTIVE AGENCY
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.
5월
31일
챌린지 시작일
2026년 5월 31일 오후 03:00
챌린지 종료일
2026년 6월 25일 오후 02:30
All
34 lectures ∙ (1hr 36min)
Course Materials:
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 🎟️
All
48 reviews
5.0
48 reviews
Reviews 1
∙
Average Rating 5.0
5
It feels like doing daily quests in a game. If I don't complete them, I don't feel quite right. It's very helpful for building habits, as it's becoming a part of my routine.
Thank you for the great review 😊
Reviews 112
∙
Average Rating 4.5
Reviews 98
∙
Average Rating 4.8
5
The challenge concept changed completely this time, so it's really fun!
Hehe... what a relief.. Thank you 😊
Reviews 27
∙
Average Rating 5.0
5
This is a fresh challenge. A round of applause for the staff who must have nearly lost their hair coming up with this project.
Fortunately, my head is still attached! ☺️
Reviews 6
∙
Average Rating 5.0
Edited
5
It was a three-week period that could be seen as short or long, but thanks to this, I—who only knew CSS—was able to study JavaScript, jQuery, Ajax, and Python. I even managed to focus on creating my own personal archive page. Thanks to this challenge, I’ve been consistently planting "grass" on my GitHub, which made this experience incredibly meaningful for me. It was difficult to build the habit at first, but communicating with other participants during the mid-challenge live sessions and seeing the work of those who had been doing it longer gave me so much motivation! To those who are hesitating and wondering, "Can I really do this consistently for three weeks?"—there is a saying that "starting is half the battle." Even if it seems difficult, just try it. When you look at your final day's mission certification compared to your very first one on Day 2, you will face a version of yourself that has grown tremendously. Dora and Simon, who ran this fun challenge, you really left a lasting impression on me. I’m always rooting for you!
To our Hongsi Nugget who participated so hard, thank you ☺️
이 강의의 지난 수강평
A. Please note that the early bird discount for this challenge runs until May 21, and the discount will end starting from May 22.
A. When you purchase a challenge lecture, a 26% discount coupon will be automatically issued.
However, please note that the coupon must be used within 3 days of issuance, and coupon restoration (reissuance) is not provided once it expires.
A. For this challenge, both 'online and offline lectures' are recognized for learning.
(ex. Anything related to learning, such as books, academies, and workbooks, is acceptable.)
However, you only need to be able to verify your study environment and 30 minutes of study time via a timer through a photo.
Detailed information will be provided in the "Must-Read Study Verification Guide."
A. For this challenge, both 'online and offline lectures' are recognized for learning.
(ex. Anything related to learning, such as books, academies, and workbooks, is acceptable.)
However, you only need to be able to verify your study environment and 30 minutes of study time via a timer through a photo.
Detailed information will be provided in the mandatory study verification guide.
A. The timing of course registration and purchase does not matter.
You can freely study any course you want and submit missions within the challenge period.
(Both previously purchased courses and courses from other platforms are eligible.)
A. The prize money will be paid in cash, and we may request personal information for payment purposes depending on the prize amount at a later date.
A. The final prize money will be paid in stages according to the number of culprits correctly identified.
Complete Chapter 1: 1 correct answer: 3,000 KRW
Complete Chapter 2: Correctly identify 2 people: 6,000 KRW
Complete 3 chapters: 3 correct answers: 9,000 KRW + additional payment of the remaining balance after Level 1 and 2 payouts
Additionally, even if you don't correctly identify all the culprits, there are separate prizes prepared for diligent participants, including MVP goods and a Diligent Runner-up Prize (5,000 Inflearn points).
A. Participation in the two live sessions is optional, and an Inflearn Random Point Event is prepared for those who attend, so we look forward to your active participation.
A. All missions must be submitted within the specified deadline, and the submission deadline is listed at the top of each mission information page.
Missions past the deadline cannot be submitted or recognized under any circumstances.
A. Please leave any questions you have through the 'Inquiry' window on the right :)
A. It is Inflearn's unique AI learning agent that understands the lectures, converses with you, and teaches in your own way.
It can be used in your classroom for both free and paid courses.
Special benefits for challenge participants—meet the beta version of Inflearn's Learning AI right now.
취소 및 환불 규정
챌린지는 지식공유자가 설정한 수업 최소 정원이 충족되지 않을 경우, 폐강 안내가 고지되며 결제 내역이 자동취소됩니다.
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