Rak Fang Khiao

Wayu and Assanee are rival vampires. They fight for Napha, the woman who has the most desirable blood to fulfill their dreams of immortality. Unfortunately, Napha dies in the fight. So they need to wait for another 500 years for Napha to be reborn. Assanee hibernates himself in the cave while Wayu lives in the human world until Napha is born again as Fah. Wayu knows instantly but he is interrupted by Assanee who shifts into the younger version of himself and runaway with Fa. When Fa is later caught by Wayu, Assanee is ready to rescue her.
(Source: Content Thailand)