You were walking along the streets of Seoul by yourself walking home from work. You put your jacket on since it was starting to get cold out. You saw a man with green hair and a heavy looking black bag. He kind of looked like a zombie. He was really buff and he looked good, though.

Changbin, which you didn't know his name, walked into an alley and before you had time to think, your feet followed him. He went through a door, which you followed through. It looked like a laboratory, full of green viles of bubbling liquid. You accidentally kicked an empty bottle on the floor, making a noise in the almost dead silent room. Changbin dropped he bag on the floor carefully and turned.

Who's there?