It was end of the year, whole Super Junior (including Zhou Mi and Henry) was celebrating their succesful year. In the middle of partying, Leeteuk gets idea, "lets go to different club!" in the other side of Seoul.

Ryewook have to go with same car with Yesung, but he has reasons why he doesn't want to.
Yesung has his own reasons why he wants go wiht Ryeowook.

Really good description, isn't it?