Overview:

Hyeon-soo's younger brother Kang-tae visits the house of Hyeon-soo and Min-jeong, who are enjoying their honeymoon. Min-jeong is in favor of a kind Kang-tae. Kang-tae consults his junior, Na-hee, that he seems to like his sister-in-law. Na-hee says to get over himself, but Kang-tae actively seduces Min-jeong...