Wen Jin, a gifted fashion designer burdened by a family vendetta, deliberately approaches Lu Che to become a substitute for the woman he loves, using his influence to exact revenge. She sneaks into a hotel but enters the wrong room. When she wakes the next morning, the man beside her is Lu Yanchen, Lu Che's younger brother, who has secretly loved her for five years. Caught between the brothers, she exploits Lu Che's resources to pursue her revenge but gradually finds herself moved by Lu Yanchen's deep devotion. Lu Che regards her as a replaceable pawn, while Lu Yanchen is determined to protect her. Afraid to give her heart to anyone, Wen Jin eventually joins forces with Lu Yanchen to defeat her enemies and settle her family's vendetta. Their fateful connection began with that one mistaken hotel room.