Housewife Mina lives happily with her husband and father-in-law, but harbors a secret desire she cannot reveal to anyone. Fearing her husband's discovery, she struggles to suppress her growing attraction toward her father-in-law, eventually giving in to her feelings while caring for him. However, while she is away, he suffers an injury, and her husband abruptly decides to move him into a care facility. With only four days left before he leaves, Mina and her father-in-law grow closer, their bond deepening into a forbidden lovers' relationship. Their passion intensifies each day, until finally, they can no longer restrain themselves...