Suparb Burut Satan (2008)

Lilly, a rich girl returning from America, is assigned a bodyguard, San, by her father, Rarm, unaware that San is his wife’s son. San’s mother abandoned him and his sick sister, Dao. Believing Lilly is the daughter of his mother and her husband, San despises her, thinking she lives in luxury while his sister suffers. He takes the job as her bodyguard for revenge.