Heh, the Green Tea Side Character Is Much Softer Than the Heroine

"Transmigration power fantasy + face-slapping + comedy + cute, beautiful heroine" I transmigrated back into the campus beauty’s backup boyfriend. Every day, she sees me transmigrated as a Cthulhu deity, yet acts as if the original host wronged her. The stunning campus beauty tricked me into bankruptcy? As a Cthulhu deity, I used my divine power on the very first day after transmigrating, plunging the world into darkness. The campus beauty’s devoted admirer comes looking for trouble? Dead. I’m a villain now, so anyone who messes with me gets killed. What’s the problem? Cthulhu: “I’ve restricted your abilities. From now on, you can’t do whatever you want. Behave yourself.” Hero, who transmigrated into this world: I’m your own son! You can’t treat me like this! I, I want to be somebody in this world! The heroine listened intently to every lesson, constantly taking notes, asking questions, and practicing. The transmigrated protagonist returned and used his unique teaching methods to spark the girl’s interest in learning, gradually helping her grasp the wonder and joy of knowledge. They could hardly believe their eyes: the girl once thought incapable of getting into high school had made an amazing comeback under Gu Cheng’s careful guidance! Every novel has a stepping stone sacrificed to advance the male and female leads. In supernatural novels, he’s the grandfather who dies within the first two chapters! In campus beauty stories, he’s the honest backup boyfriend! In horror game stories, he’s an APC! In live-in son-in-law novels, he’s the father-in-law! But don’t forget, he is Cthulhu. Once he transmigrates into the role of a cannon-fodder character, Cthulhu will descend along with him.