The Broken Hearts Club is a support group for university students who have suffered from failed romances. It helps them to build trust again and to broaden their horizons through volunteer activities and community service.

Scientist Young-il saves the life of his brother Do-il by transforming him into a cyborg which grants the latter superhuman powers. The brothers then team up with agents from Interpol to track down Ban-ji, the man who had nearly killed Do-il and who has kidnapped their father.