Nam Seo-jeong

Ji-seo, the third daughter, is tasked by her father with finding the youngest sibling who has run away with gold.

Eunyu, a high school library captain, loses the book in which she kept the donations. Shortly after, Baekji, a member of the library club, returns the book that Eunyu had lost, but the money has disappeared. Coincidentally, Eunyu had witnessed Baekji shoplifting at a supermarket, and Eunyu's suspicion of Baekji begins to grow.