The tenant of apartment room number 405, 'Chan U'...a young man who likes rap and appreciates rhyming rhythms and is preparing to take the 5th year police training exam...had a lot of drinking at night and woke up the next morning to find that a man had been killed next to his bed... Unfortunately, he wakes up in room number 404, where he normally makes a lot of noise and doesn't have a good relationship, and he doesn't remember anything that happened. How can a Chan-u continue? What happened when he was drunk and asleep? Did he kill people without even knowing it? Or was it threatened? Let's find out while watching this movie