Chairman Ga proposes marriage to Yeong-ran. She accepts, mortgaging her life to escape her debts. To avoid his stepdaughter, Ga Sun-young, who is after his fortune, she assumes the false identity of "Boo Se-mi" and prepares to leave for the countryside, Muchang.

Young-ran, transformed into a complete opposite of her past self, disguises herself as a kindergarten teacher, Boo Se-mi, and sets foot in Muchang for the first time. As she adjusts to the unfamiliar routine, she encounters Dong-min, who happens to pass by her at the Gahoejang mansion, and a strange tension begins to flow between them.

Young-ran struggles to adjust to kindergarten life. Her first class and the theft of her kindergarten tuition deepen her conflict with the villagers. Amidst nationwide attention focused on the widow of a defunct conglomerate chairman, Young-ran hosts a welcoming party of her own to avoid the villagers' suspicions.