Private detective HONG Gil-dong is seeking revenge for his mother who was murdered in front of him when he was a child. An investigation determines that the assailant is a man named Kim, but when he arrives at the Kim's house, he finds only the man's grandchildren who tell him that their grandfather was kidnapped. Hong tracks down the vicious kidnapper with help from the grandchildren, but senses that he is not acting alone. The mastermind is the notorious leader of a massive cult - a man with a terrifying, bloody secret in his hands. Now, Hong decides to face him once and for all. Written by CJ Entertainment

Sung-Chil works at the Jang-Soo Store which is owned by Jang-Soo. Sung-Chil is stubborn and has a bad temper, but he changes after meeting Geum-Nim. Geun-Nim runs a flower shop and her daughter Min-Jung does not like her meeting Sung-Chil.

10 years after "Marrying the Mafia 1". The three J's established an architecture company and have become well-known business. They hold pens instead of fists in their hands but things still happen around them and now even bother their children.