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On My First Day Undercover, the Organization Collapsed

잠입 첫날, 조직이 멸망했다

Native Language Korean

Released 2025

Author플라이스

TypeWeb Novel (KR)

Original Ch.: 211

Translated Ch.: 10

Rank: #150

Last Update: February 13, 2026

Original Pub.: KW Books

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On My First Day Undercover, the Organization Collapsed is a popular novel that blends Action, Adventure, Comedy and more. Written by the author 플라이스. 10 chapters have been translated, and translation of other chapters is in progress.

Synopsis

On the very first day of his undercover mission, the world’s most feared assassin—known only as Wraith—receives a coded message confirming the unimaginable: the assassination organization that raised, trained, and brainwashed him for twenty years has been annihilated. The final mental shackles binding his mind snap, and for the first time in his life, he is free. Assuming the identity Ziel Steelheart, a general education instructor at the prestigious Edelvine Academy’s Sword School, he begins his new life with a single goal—survive, adapt, and remain hidden. But as the Empire hunts the remnants of his former group, the greatest assassin now walks among noble students… as their teacher.

Action Adventure Comedy Fantasy School Life

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Editor's Note

💡 This is a "comfort slop" novel—and I mean that in the best way possible. It doesn't reinvent the wheel, but it delivers exactly what it promises: an OP protagonist who is a genius at killing but a toddler at life. The humor comes from Ziel’s assassin-level paranoia being applied to mundane things, like school budgets or student complaints. It’s a "healing" story disguised as a power fantasy.

"211 chapters of soft landings. Long enough to bond, short enough to not overstay."

Experience Curve

Ch. 1–20 (The Freedom Shock): ⭐⭐⭐⭐⭐ – The Hook. The moment the brainwashing breaks and Ziel realizes he can eat whatever he wants is surprisingly touching and hilarious.

Ch. 21–100 (Professor Life): ⭐⭐⭐⭐ – The Peak. Watching him treat a classroom like a tactical battlefield. His "zero-tolerance" policies and the students' growing respect for their "scary but cool" teacher are the highlights.

Ch. 101–211 (The Loop): ⭐⭐⭐ – The Plateau. The writing can become repetitive. The author often relies on making side characters look incompetent to highlight Ziel’s competence. If you like the formula, you'll love it; if not, it might feel like "consumable slop."

WebNovelDB Review

7 /10

Heartwarming, hilarious, and occasionally brain-dead—a perfect palate cleanser.

The Protagonist (The Strong Point): Ziel is genuinely "cute" in his cluelessness. He isn't "edge-lord" dark; he’s just a guy who was never allowed to have a personality. Seeing him discover the joy of six meals a day or the satisfaction of a student’s growth is great.

Comedy of Misunderstanding: The classic "Ainz" or "King" effect. His blunt assassin logic is interpreted by noble students as "profound wisdom" or "unrivaled charisma."

World Building (The Weak Point): The setting is a bit generic. The "prestigious" academy often feels incompetent just so Ziel can solve every problem.

Reader Archetype: You enjoy The Way of the Househusband or Spy x Family. You want a story where the MC is untouchable in a fight but struggles to buy a sandwich.

Not For You If: You need your OP MC to struggle in fights. Ziel's victories are never in doubt. The tension isn't 'will he win?' but 'will he remember to eat lunch?' If that sounds boring, skip it.

WebNovelDB Team

Key Information

Main Characters: Ziel Steelheart (Ex-Assassin Wraith; emotionally stunted teacher), Gilbert (The best friend/adjutant figure), The Students (A variety of noble brats who become Ziel's "found family").

Power System: Pure physical mastery and assassination arts; Ziel is a "walking disaster" whose skills are far beyond the academic standard.

Themes: Learning to be Human, Teacher-Student Bonds, Freedom from Brainwashing, and Financial Illiteracy.

Similar To: Academy’s Undercover Professor

Reading Progress

Not Started Chapters: 0 Rating: -

Where to Read

Novel Raw (page.kakao.com)

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