1) A lecturer accuses the main character, Yon Li, of cheating on an exam despite Yon Li denying it, due to the lecturer's initial negative impression of Yon Li as a troublemaker. 2) Flashbacks reveal that Yon Li used to bully others but had a change in attitude after his mother fell ill, working hard in school instead. 3) While the lecturer remains biased due to confirmation bias, Yon Li's classmates notice his change in behavior and motivation due to his mother's illness, showing the impact of social perception and extrinsic motivation on attitudes.