Ruk Nai Roy Kaen (1992)

Phatyot and Ongon's parents were best friends and then Ongon's father betrayed Phatyot's father and they became sworn enemies. Although they hated each other, no one stepped into the other's territory because both were of equal power. Phatyot and Ongon meet at an art gallery and their families don't know they like each other. One day they go to a party and they are finally going to introduce their parents to the person they are "dating" and the truth is revealed. Later, the guy who was supposed to marry Ongon kills Phatyot's cousin and Ongon's brother, but Phatyot is the one accused of the murder. When the truth is finally revealed, it might be too late.