Occupation: Student Do-Hoon's personality changes over time throughout the series. In the beginning, Do-Hoon was depressed and had feelings of self-harm and suicide. He was also anxious, had feelings of loneliness, and believed that he couldn't do anything right. However, after meeting Min A-Ji, Do-Hoon eventually becomes more confident in himself, despite still getting scared easily. He becomes outgoing and friendly and becomes more social at school and in general. Do-Hoon also becomes more brave and courageous as time goes on after being put in numerous dangerous situations.