Teacher Gangstar.

Meng Xiao Hu, the adopted son of a gang leader, loves history, fighting, and women. On the day of his graduation for his master degree on history, he accidentally falls from a building and crushes a dog after fighting his enemy. The earth god gives him a second chance at life because he had tried to get one of his underlings to save the dog in his last moments. However, his punishment for leading a perverted life is that if he tries to make moves on a woman, he turns into a dog.