Jung-tae has become a successful businessman. One day, he calls for a substitute driver, but the driver was Min-goo, the man who married his crush, Yoo-ri. Jung-tae still hadn't forgotten Yoo-ri and learns that life if tough for this couple. Jung-tae suggests something to Min-goo and that is to let him live with Yoo-ri for a year in return for 300 million won and his house.
If you give it once, a good brother-in-law who gives everything generously will come! At the house of her girlfriend Jin-kyung, who lives with pumice stone, her brother and his wife suddenly visit and the four of them live together. At first, Kyung-seok, who was burdened by his girlfriend's brother, began to keep his eyes on his wife, Yeon-su. A bold brother-in-law who walks around in no-bra and panties without hesitation even at his sister-in-law's house. Besides, from a certain moment, he starts to send a hand of temptation to Pyeong-seok first...
Ha-yeong is a successful psychologist. One day she gets a secretive request from her sister Ha-joo. Apparently Ha-joo's husband Woo-seong is refusing to have sex. Ha-yeong agrees to be their couple therapist but finds out that her brother-in-law actually has sexual desires for her and not her sister...