Suparb Burut Satan(2008)

Suparb Burut Satan is a Thai drama series following Lilly, a wealthy woman who returns home from America after her stepmother forced her abroad. Her father hires San as her bodyguard, unaware that San is actually her stepmother's abandoned son. San harbors deep resentment toward Lilly, believing she is his half-sister living in luxury while he and his gravely ill sister Dao struggle to survive. Consumed by a desire for revenge, San takes the position close to her, setting in motion a tense dynamic filled with hidden identities and conflicting emotions. As secrets unravel, the two must confront the truth about their family connections and whether vengeance can ever lead to redemption.