Yu Yan once saw Song Yanci as her salvation, only to face his betrayal before their wedding when he proposed an "open relationship." Seven years of sincere devotion turned into a joke. Awakening to the truth, she strikes back with a carefully orchestrated "cuckolding scandal" and becomes entangled in a forbidden affair with Song Yanci's younger brother, Song Huaixu, who suffers from bipolar disorder. From then on, Yu Yan moves between the two brothers, secretly shifting her business interests, only to gradually discover the deep, long-suppressed love Song Huaixu has harbored for years. In the end, the brothers' accumulated resentment erupts, and on the edge of killing, Yu Yan pulls Song Huaixu back. The two, who save each other, finally become a couple.