Yoo-Suk looks for a girlfriend who disappeared. Ae-Yeon has a fake diamond which her ex-boyfriend gave to her. Ae-Yeon was dumped by her ex boyfriend. Byung-Chan does not believe in love. Bok-Nam is in love with a friend of a friend.

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.

Reporter Na-yeong and her partner investigate a series of mysterious deaths and a perplexing case where her source was allegedly already dead at the time of their interview. Together they end up confronting a terrifying truth.