Yeong-ran, una mujer de último nivel con antecedentes penales y deudas, es contratada milagrosamente como guardaespaldas personal de Ga Seong-ho, presidente de chaebol, de 70 años.
Yeong-ran acepta la propuesta de matrimonio del Presidente Ga para saldar sus deudas. Adopta el alias "Boo Se-mi" para esconderse de su hijastra Ga Seon-yeong, quien busca su fortuna.
Yeong-ran se disfraza de maestra de jardín de infantes Boo Se-mi para encajar en Muchang. Allí se encuentra con Dong-min y una extraña tensión crece entre ellos.
Yeong 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.
An unexpected guest appears at the welcoming party, and the crisis becomes an opportunity. While Yeong Ran gains the trust of the villagers, Lee Don, the headman's lawyer, faces a threat.
Yeong Ran, whose identity is revealed to single dad Dongmin, approaches his son Ju Won, his weak point. Meanwhile, Yeong Ran is arrested by the police after an unexpected incident at kindergarten.
An uninvited guest with knowledge of Yeong Ran's past appears in Muchang. As tangled family histories and childhood memories resurface, Dong Min's son, Ju Won, goes missing in the village. Yeong Ran instinctively sets out to find Ju Won.
A shocking incident nearly resulted in the loss of a loved one. Determined to remain hidden, Yeong Ran heads to Seoul. At a press conference, she reveals her identity and declares a direct confrontation with Chairman Ga's stepdaughter.
At the edge of despair, a shocking figure appears before Yeong Ran. Holding the key to turning the situation around, Yeong Ran risks everything to save Dong Min.
The long-awaited shareholders' meeting. Just as Seon Yeong is being appointed as the group's next CEO, Yeong Ran appears at the meeting and reveals Seon Yeong's ugly face to the world.
