they r actually talking about the hongdo club. the ahjumma said to come at 9, the hottest time. yh is immitating the dj. at first kim heesun play around with his joke. the 2nd time yh jokes about it heesun actually teasing him make poker face and act like 'just enough already, i'm not gonna accept the joke, it not funny anymore' to annoyed him. thats y yh run after her like he's gonna hit her. they bassically playing around, banter like a real siblings. thats what gummi said
강지환's acting talent supported and inspired me during my difficult times. If anyone close to him sees this message, please tell him that his audience loves him and is waiting for his return. Wish happy days for him
