Jong-tae and Eun-mi, were invited to the housewarming of Seung-gyu and Yoon-hee. Seung-gyu learns that his senior's business is almost on the verge of bankruptcy. Seung-gyu suggests staying together for a while to his senior who was vigorously frightened to avoid the debtor. After a few days, the couples get to drink and play a wish-making game. Seung-gyu, who won the game, offers a swapping offer...