Looking for a Hong Kong ghost film series, the name has been forgotten.

Mr Wei Long of the school is also called a ghost.

Actors: Lu Haipeng, Joey Meng Yee Man Iman, Mo Jiayao and Woon Yee Ng.

Summary: Lin Shirong (Lu Haipeng) is a disciple of Huang Feihong. Due to many sins in his previous life, he was temporarily unable to reincarnate, and his soul has been exiled to an aristocratic middle school. Cui (,) and Shi Hexing of Class 1, Grade 7 were dissatisfied with the collusion between the principal Liao (,) and the discipline director Ouyang Xiecheng (Lu Haipeng), so they set a trap to tease them, but they died unexpectedly. Rong took the opportunity to come back to life, suddenly became a teacher and made a series of jokes, which made the campus full of vitality. Just when the campus was warm, the adult souls returned to the campus, took back their bodies and launched a big war in the spiritual world!

But I can't go down now. I've been looking for it for a long time.