Nice Sister-In-Law 4

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...

"Trust me tonight" Min-ho is preparing to get a job and is spending some time in his parents' house. However, his parents aren't home and only his young sister-in-law is there. His brother Hyeon-soo had left the house after fighting with his wife. Min-ho can't help but feel attracted towards his young and appealing sister-in-law.

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...

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 sexy 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.

Young-cheol, faced with boredom, keeps looking at his younger and sexy sister-in-law than his wife who doesn't want him. The only two living together with my sister-in-law started with my wife's runaway! Young-cheol falls helplessly in front of her sticky temptation.