Yu Dayun is the younger sister of Yu Ijin. Dayun is small, black-haired girl in her teens who is considered to be one of the prettiest girls in the school and she was popular in her younger years due to her intellect and looks. When her parents died and her brother, Ijin, went missing, she started living with her grandfather. She was the most popular girl in middle school, which led to many guys asking her out. Because of this, Heejin Kim and other jealous girls in her school started bullying her, forcing her to buy snacks for them and taking any opportunity to physically abuse her. Eventually, she was reunited with her brother, who took care of the bullies for her. (Source: Mercenary Enrollment Wikia)
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Yu Dayun is the younger sister of Yu Ijin. Dayun is small, black-haired girl in her teens who is considered to be one of the prettiest girls in the school and she was popular in her younger years due to her intellect and looks. When her parents died and her brother, Ijin, went missing, she started living with her grandfather. She was the most popular girl in middle school, which led to many guys asking her out. Because of this, Heejin Kim and other jealous girls in her school started bullying her, forcing her to buy snacks for them and taking any opportunity to physically abuse her. Eventually, she was reunited with her brother, who took care of the bullies for her. (Source: Mercenary Enrollment Wikia)
