He Yining and Song Chengyuan, married for twenty-two years, appear affectionate on the surface, yet the husband says goodnight to an empty bed every night, while late at night the bedroom frequently reveals a warm mattress, unfamiliar long hair, and ambiguous sounds. Suspicious that her husband is hiding secrets, she remains vigilant after drinking calming milk, lifts the hidden basement beneath the bed, and pulls out half an old photograph and anonymous massive money transfers. Mistaking her best friend for an associated person, and after experiencing misunderstandings, gathering evidence, and confrontations, she traces the matter to a hospital only to discover behind the concealment a long-standing past filled with scars, facing the truth amidst the pulling and tearing of suspicion and familial affection, completing self-growth.