A business deal. An arranged engagement. A past neither of them remembers-yet. Bound by family expectations and corporate power, Chaeyoung and Mina are forced into each other's lives, where buried trauma, old scars, and an unexplainable pull begin to surface. What starts as obligation slowly tightens into something dangerous, tender, and impossible to ignore. Some bonds aren't made. They're remembered.

Son Chaeyoung is an artist and player who, to win against her best friend Dahyun, bets that she can make anyone fall in love with her in 10 days. Myoui Mina has been assigned to write an article on "How to Lose Someone in 10 days." The story is loosely based on the movie "How to lose a guy in 10 days" but adapted for the michaeng universe.