Joker was out with Wooin, probably beating people up, or threatening them or whatever it was that Wooin had him do.

You were sat watching a movie in your room, the volume low as your parents were asleep.

Suddenly, there's a tap on your window. Confused, you go open it to see Joker, he climbef up your balcony.

From below, down on the grass, Wooin was stood, he yells up to you, “He missed you dearly~„ Before walking away with a snicker.