After marrying into a notorious gangster family, a man finds himself entangled in a dangerous web of crime and must navigate his way through the treacherous world of the mafia.

This gangster comedy chronicles the White Tiger Family of Jeolla Province. Hong Deok-ja, head of the crime family, quits the syndicate to open a kimchi business after her son marries a prosecutor. She is pulled back into the crime family when the familiar member of the rival Axe Gang is released from prison and seeks revenge upon the White Tiger Family.

President Hong’s family hit an all-time high after succeeding in their business. The family members, who have been prohibited from leaving the country for years for being involved in gang-related incidents, are finally allowed to go overseas and start preparing for a trip for the first time, but their plans don’t go smoothly

The oldest son of the White Tiger Gang is pressured by his family to settle down and get married; but when he finds the perfect girl, she turns out to be a state prosecutor for crimes of violence, specifically gangster related. The district attorney is a look-a-like of the gangster's former fiancee who died getting hit by a truck. Their feelings develop for each other but her co-worker turns out to like her as well. She does not like him so the latter turns to the darker side of the law, by conspiring with the rival Axe Gang. Unfortunately for him, the mafia son has more that a few tricks up his sleeve and gets support from his dim-witted brothers and henchman.

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.

Here we have the legendary family back! The glory of the family is marriage?! The great plan of marriage is unfolding! The legendary Jang's family who holds money and power! There is only one troublemaker for Ms. Hong, the head of the family, who is Jin-kyung, the youngest daughter who declared to stay single. One day, 'Jin-kyung' has a one night stand with 'Dae-seo' whom she saw for the first time. When the Jang family find out about this, they start all sorts of plots to get 'Dae-seo' who has the best condition of being son-in-law to marry 'Jin-kyung'... The biggest task ever thrown to the Jang’s family! Will the marriage of the century be successful?