Khun Nu Chantana (2009)

Nedpathu is a spoiled child. Her hatred toward her step-mother turned her behavior and attitude out of control. Her father, Chairman Porpong decided to re-establish his daughter by offering a bet. In order to inherit the factory, she must disguise herself as an average person working at the factory starting from the lowest position. She takes on the challenge but there's a catch. She is not allowed to disclose her real identity and she not allowed any aid.