Yai Bai Bah

Sabai is in an institute because she's crazy or pretending to be, no one knows. She was raised by a very rich man. Anticipating his imminent death, he leaves the code to his safe for his crazy daughter Sabai. After burying the patriarch and learning from the will that everything went to Sabai, each member of the family tries to pull her over to their side in order to find out where the key and code from the safe are.
Kawin, the son of the family's lawyer, after a while begins to suspect that Sabai is not as crazy as she wants to seem so he sets out to prove that she's sane.
(Source: asianfuse.net; alliance-fansub.ru)