Cha Wooseok (Wi Hajun) receives a mysterious call from an informant who claims to have evidence of a fraud-related murder. Before revealing the truth, the informant falls to her death. Wooseok’s investigation leads him to Royal Auction and its chief auctioneer, Han Seol-ah (Park Minyoung), whose three fiancés have all died under suspicious circumstances. To expose the truth, or perhaps to test her, Wooseok proposes they fake a relationship. As he uncovers her secrets, he realizes he may have stepped into a web he can’t escape—and that getting out could cost him everything.

A devoted working mom, Jeong-eun, prepares her daughter for the crucial "7-year-old exam" while leaving her mother, Ji-ah, to handle tutoring, creating a hectic yet heartwarming three-generation family dynamic.