Namjuga Eopseumyeon Nae Seongjeogi Manghanda

"It's amazing enough that I've reincarnated, but now I'm stuck as an extra in a romantic comic?!"
Han Ji-seo, a K-high school student, has unexpectedly become an extra who is perpetually ranked second in a romantic comic. No matter what she does, she's always second in her class and has no significant role... What luck! Thanks to this, Ji-seo has been living her days without worrying about studying. However, she suddenly ends up with the lowest score on a surprise quiz. What's different this time is the absence of Joo Yi-won, the male lead who is always ranked first! To get into university, the male lead must be present at school. The goal is to ensure the male lead's perfect attendance! Now, Ji-seo will start her plan to maintain the male lead's peaceful school life!!
(Source: KakaoPage, translated)