After the loss of a loved one, Ji-Su is offered a helping hand from her late grandmother’s student, who provides her with a place to stay and takes her under her wing. Despite her wish to get along, Ji-Su gets off on the wrong foot with their only son, Ha-Jin, who mistakes her for a stalker after he encounters her on his doorstep. Will Ji-Su be able to resolve this misunderstanding and befriend Ha-Jin? Or will their relationship turn into something more?