In a world where marriage is a high-stakes, cutthroat business, Yoshihiro Ike stars as a cynical and highly successful "marriage toxin"—a professional matchbreaker hired to sabotage relationships for wealthy clients. But his carefully controlled life is upended when he meets a fiercely idealistic wedding planner who sees through his schemes and challenges him to use his skills for good instead of destruction. As their professional rivalry sparks into an unexpected partnership, the two must navigate a series of chaotic assignments that force them to confront their own hidden vulnerabilities and the true meaning of love. Blending sharp comedy with heartfelt romance, this series explores the messy, often absurd lengths people go to in the name of love, while its central duo discovers that even the most toxic matchmaker might have a heart worth fighting for.