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The MCs are in a Chinese sword fantasy wuxia, where characters learn special martial arts through years of training to become immortal. Basic plot elements involve martial arts schools, superpowers, Masters/students and sword fighting. In these stories, there is a "right" and "wrong" way to train. Wrong way = demonic way growing strong by more malicious means.
The MCs are in a pretty classic setup for these.
Master trains this star pupil who becomes the big shot has a 50% of being actually "evil".
Then, a character with a poor background is enrolled at their school and shows everyone how cool they are. The star pupil gets jealous and does something to the Poor Character.
Poor Character then gains a new power to fight back bring down the star pupil and win the day.
The MCs are in the roles of the Master and the star pupil.