High school student Kang Chul-joing awoke in an unknown locked room.
He finds himself in a chaotic situation, he searched around the room and found an old MP3.
What he learned from the message left on the MP3 was that he was poisoned and that he had only three hours left to live.
Kang Chul-joong, who was usually a mystery quiz enthusiast, tries to escape the unknown room by finding clues based on his reasoning skills that he has accumulated over the years.
However, the reality is different from the ideal.
What is the last clue that he noticed when he made a series of mistakes and ended up in an urgent situation where the poison spread and he start vomiting blood?!

A new survival game presented by Baek Ji-woon the creator of "Struggle" and "Undead King"!
Is there any way to escape this hellish secret room!

평범한 고등학생이었던 강철중, 어느 날 그가 잠에서 깨어나보니 처음 보는 밀실에 갇혀 있었다.
혼란스러운 상황에서 주변을 뒤져 발견한 것은 낡은 MP3 하나.
MP3에 남아있던 메시지로 알게 된 것은 자신이 독이 중독되어 있다는 것과 앞으로 목숨이 3시간밖에 남지 않았다는 충격적인 사실이었다.
평소 추리 퀴즈 마니아였던 강철중은 몇 년 동안 쌓아온 추리 실력을 토대로 단서를 찾아 밀실을 탈출하려고 노력한다.
하지만 이상과 현실은 다른 법.
실수를 연발하다 결국 독이 퍼져 피를 토하는 급박한 상황에 이르게 된 그의 눈에 띈 마지막 단서는 과연?!

<스트러글> <언데드킹>의 백지운 작가가 선보이는 새로운 생존 게임!
이 지옥 같은 밀실을 탈출할 방법은 있을 것인가!

A mysterious person who claims to be the gatekeeper of the underworld suddenly joined the class WeChat group of high school students. This person started posting tasks to the group and rewarded those who completed them with money. At the start, the students were thrilled to receive rewards for completing the tasks. However, it did not take long for them to learn that failure to complete their task would lead to sudden death. Eventually, the entire class became playthings of the “underworld gatekeeper”

The fourth collection of the author's works from *Rakuen* magazine. At times painful, at times comical, these are tales of men and women spun from elegant and beautiful thread. Also includes sequels to earlier oneshots.