In the late 1990s, teacher Wen Nian marries He Lie, a notorious general contractor in the surrounding villages. On their wedding night, He Lie sets a mutual non-interference agreement, but deep in her heart, Wen Nian hides her secret crush of seven years on a mysterious benefactor, "Sir," writing all her thoughts into her diary. On a stormy day, He Lie accidentally reads the diary, burning with jealousy, and treats Wen Nian with cruelty and paranoia as conflicts continuously erupt between them. Later, as the truth is revealed, the "Sir" Wen Nian yearned for day and night turns out to be none other than He Lie himself, who had silently funded her in her early working days. After clearing up their misunderstandings, the two run toward each other, joining hands to fight against business rivals and toxic relatives. Having endured pregnancy twists and the life-and-death ordeal of premature birth, both their career and family achieve a happy double completion.