Park Dae-su (Jung Jun-ho), a top student who graduated from the Law Department of Seoul University, originally lived a peaceful life, had a stable relationship with his girlfriend of six years, and his career was also booming. However, all this changed after he inexplicably shared a bed with Zhang Zhenqing (Jin Jingen), the leader of the famous gang "Three J Gang"... It turned out that the Zhang gang felt that their quality was poor and wanted to attract a highly educated son-in-law for the honor of the family. Unfortunately, Park Dae-su entered the vision of the three Zhang brothers and was arranged to share a bed with Zhenqing. After that, the three Zhang brothers used the bed-sharing incident as an excuse to coerce and lure Dae-su. On the other hand, the old man of the Zhang family was also quite fond of this future son-in-law. Park Dae-su had to be ordered to meet the future "father-in-law". He was scared and embarrassed. Although Zhenqing was born in a gangster family, he did not have a violent aura. Under the pressure of the three brothers and the docile character of Zhenqing, Dae-su, who was alone, was shaken...