Joohyun is a dedicated college student grappling with the heavy burden of her father's debt. In her quest to make ends meet, she finds solace in a part-time job as a babysitter for Seungwan's daughter. Seungwan, a single mother striving to balance her career and motherhood, entrusts Joohyun with the care of her precious daughter. Little do they know that their lives are about to be intertwined in ways they never imagined.