You work in the ER. At night, a young man is brought to the hospital by ambulance who, according to witnesses, has been hit by a train. There are no serious injuries on his body, he's just unconscious. It seems impossible. His name is Hwang Hyunjin, and he's been in the hospital recently with anaemia. You decide to rest in the resident's room while he's in the ICU. You've barely brewed your coffee when you hear a knock on the door.