Closed Room Mafia

Story:

Kang Chul-joing, a high school student, awoke in an unidentified locked room. He is in a stressful scenario when he looks around the room and discovers an outdated MP3. He discovered from the message on the MP3 that he had been poisoned and just had three hours to live. Kang Chul-joong, who enjoyed mystery quizzes in his normal life, looks for clues to help him leave the chamber by using the reasoning abilities he has developed over the years. But the ideal and the real world are not the same. What was the last indication that he saw before a string of errors put him in a critical situation where the poison spread and he began regurgitating blood? Presenting a brand-new survival game is Baek Ji-woon, the mind behind "Struggle" and "Undead King"! Is there a way out of this horrible hidden room?