Jambok-geunmu (2005)

Caiyin (Jin Shanya is acted the role of) this policewoman is shrewd and spiteful, because of the task of tracking down the gang, she has to go back to campus to be a high school student. Having been away from campus for many years, Caiyin certainly can't keep up with other people's knowledge, and he protects himself everywhere for fear of being seen through. Huiling, an eldest sister in the class (Hong Xiuer is acted the role of) also does not like Caiyin, making it difficult for Caiyin everywhere. Because of his undercover status, Caiyin had to swallow his anger. What makes Cai Yin feel quite happy in the block is that she has a good feeling for a member of her class named Lu Rong (Kong Yu), but when she thinks of her true identity and age, Cai Yin feels depressed. The action finally made progress, the tracking object began to believe in Caiyin, she made more important clues, but the action changed again.