Rose Without Thorns (2010)

Original title: กุหลาบไร้หนาม

Nantawadee, a woman scorned by her wealthy family due to her mother's past, moves in with her half-sister Nucharee after their father's death. Fueled by jealousy, she sets out to steal everything from Nucharee — including her fiancé — and later schemes to sabotage her sister’s chance at true love.