As a fan of online literature, I can't judge whether any work is a classic or not. However, according to the information I know, Guan Zhilin and Liu Dehua have worked together on a few movies, one of which is "Playing truant". 'Playing truant' was a movie released in 1990, directed by Stephen Chou and starred by Andy Liu and Rochelle Kwan. The movie was about a teenager who played truant because he didn't want to study. He formed a group called " Truant Veyron " with his classmates and started a series of funny and exciting stories. The movie was a box office hit and became a classic in Hong Kong. The outstanding performances of Guan Zhilin and Andy Liu in the movie were also recognized by the audience. Therefore, it could be said that "Playing truant" was one of the more classic films that Andy Liu and Kwan Zhilin worked on together.