Inspirational from the novel Les liaisons dangereuses by the French writer Choderlos de Laclos, published in 1782, Dangerous liaisons transports viewers back to 1930s Shanghai. Tạ Dịch Phàm, the most notorious playboy in the city, falls for Đỗ Phấn Ngọc - a woman of purity and innocence. Meanwhile, Mạc Tiệp Dư, the promiscuous woman whom Tạ Dịch Phàm has never been able to conquer, wants him to steal the virginity of a pure-hearted schoolgirl who is promised to a wealthy man Tiệp Dư is dating. Dangerous liaisons unfold in a Shanghai filled with deceit and manipulation, where life is chaotic and love is tainted.