Yu-ting, a 16-year-old high school student, came home to find a sister of her age. In fact, the “sister” was her cousin from Vietnam, her mother’s hometown. Her uncle had broken his leg, so her mother promised to get the underage girl to work in Taiwan in the name of her adopted daughter. Was Yu-lan her sister or a migrant worker? At first, Yu-ting didn’t know what to do, but then they became best friends to share what was on their minds. However, her family got so fond of Yu-lan, and even her boyfriend fell in love with her. Yu-ting thought that the fake sister stole her life. She couldn’t help but deny the equality of them and report to the police that Yu-lan was an illegal migrant worker...