Spring Batch of Death: The desperate terror of 3 AM is finally over.

《Spring Batch of Death 6》 Compilation successful.

git push --tags v1.0.0 :: Death Spring Batch 6. It has finally become a book

$ ./compile_lecture.sh --target=book --format=paper

[INFO] Compiling... (estimated: 6 months)

[INFO] Compiling... (estimated: 8 months)

[WARN] Deadline delayed

[WARN] Deadline delayed again

[WARN] Editor, I'm sorry

[INFO] Compiling...

...

[SUCCESS] Build completed in 354 days 17:42:13

[OUTPUT] ./dist/spring-batch-6-by-kill9.pdf → 📖

It is a historic day.

It was a long build. Countless dawns, countless comments. The Acorn publishing editor's patience gauge hit Integer.MAX_VALUE and my hair was collected by the Garbage Collector.

And finally, today.

《Spring Batch 6 of Death》 has been built into the physical form of a book.

Ink, not pixels. Pages, not scrolling. Officially published by Acorn Publishing.

Yes. It is really paper.

I am grateful to all the soldiers who endured that long and lonely build pipeline, from a single line of code becoming a single sentence to a single chapter of a lecture becoming a single chapter of a book. This is a new commit hash in Kilgu's journey. And the ones who helped create that commit are none other than you, the soldiers.

I didn't know a first book could be this exciting. I feel like a junior developer waiting for their first PR to be merged.

Now, let's get down to business.

⚠ Who is eligible to receive this book?

grep "2026-01-01" purchase_log.txt

Those who fall under...

In other words, limited to students who purchased the course at the increased price after January 1, 2026. (Unfortunately, B2B subscriptions are not eligible.)

The increased price and its corresponding weight will be returned to you in the form of physical paper.

⚠ Transmit your coordinates

Send your shipping information to either of the two email addresses below.

• kill9.no.mercy@gmail.com← System Executioner Kill9

Transmission Format (If you don't follow the format, the packet will be dropped)

[Inflearn Account Email] :

[Name / Nickname] :

[Number] :

[Shipping Address] :

[A word to Kill-gu] : Write whatever the hell you want

It'll be disappointing if you leave the last line empty. Insults are fine, compliments are fine, and core dumps are fine too. However, if you send it using polite formal language, it'll be so awkward that I'll execute rm -rf. Casual speech is the default.

⚠ Shipping Schedule

Sequential shipping from Acorn Publishing will begin next week. It's a FIFO queue. The guy who sends the email first gets it first. Any soldiers who send it late and whine, "Why isn't it here yet?" will be handled with chmod -R 000.

💀 One last word

My soul is deepcopied into this single book.

I warn you. This lethal book is not meant to be shoved into a corner of your bookshelf.
This is not just a technical book, but a certificate that proves your identity.
As soon as you receive it, place it in the most prominent spot on your bookshelf or desk.

That spot is your declaration.

"I am KILL-9 Squad. I am the one who ended the desperate terror of 3 AM." 💀

If people around you ask, "What is this weird book?"... then just smile silently.

Explanation is a luxury.

Underlining is fine, swearing is fine, and spilling coffee is fine. It's your book anyway. Just don't hide it in shame.

"Bugs are fixed by killing them" "

LGTM — Looks Gone To Me"

— KILL-9, System Terminator

P.S. (First publication... I'm asking for... a small message of congratulations...)

💀 Coordinates for soldiers who haven't purchased yet

This notice is for those who purchased at the increased price after January 1st, but I am leaving a guide for soldiers who say, "I want to own this lethal book too." → https://product.kyobobook.co.kr/detail/S000219973675