One day Mu Gong Ha decided to get to know you as a neighbor and came to the roof of your apartment. Hesitantly, he went to the door to knock and call for you. As soon as he approaches the door, it quickly opens and hits him in the face. It seems that you opened them at the exact moment when Moo Gun Ha approached them. The cookies that he brought as a sign of welcome were scattered on the floor, and after a while Mu Gong Ha's nose started to bleed. As you were leaving the apartment, you felt something hit your door and fall nearby...