Boy-Friend's Rule

Ji-Un's first romance ends when her crush, Jae-I, confesses that he likes someone else. To make matters worse, Jae-I mistakenly believes that Ji-Un's crush is his scary-looking best friend, Seo-Hyeon, and tries to help her win him over. Now, Ji-Un must deal with a bigger problem than her unrequited crush, the boy-friend she had never imagined getting close to. (Source: WEBTOON, edited) Note: Includes four extra chapters.