After being discharged from the army, Moon Tak is an unemployed man who has been living at his girlfriend’s house for two years. At the club he secretly went to, he finds out the secret of his soon-to-be sister-in-law ‘Young-ah’ and receives a secret proposal. I thought it was all a secret that only the two of us knew… my girlfriend found out?! The fate between two families gets more and more twisted the more you solve it. “Bocchan… now that we’re family, will you keep that secret…?”