This story is so fucking stupid and idiotic, but it's entertaining enough that you keep on reading the chapters and keep smiling at the dumbass moments. The main love interest, the red hair guy, Yeo Chan-uk, is genuinely a dumbass.
The trope is nerd x bully. Yeo Chan-uk is the 'top fighter' at their high school, and comes from a pretty wealthy background with a stepmother. Meanwhile, Han Yu-ri has parents in jailed but is also the top student in the school, known for being an otaku, and also gets bullied a lot.
Yeo Chan-uk and Han Yu-ri get paired together as mentor/mentee because Yeo Chan-uk has horrible grades.
Where the story is at Chapter 25:
After university exams (CSAT), Han Yu-ri never saw Yeo Chan-uk again. It was like, afterwards, something odd happened. He would not answer calls or messages, and it just seemed like he just disappeared, his family moving away too.
Meanwhile, Han Yu-ri went to university with only 2 friends, but he got super popular. He grew taller and lost his baby fat, so he's super popular at the university.
One day, someone was confessing to Yu-ri very aggressively, but all of the sudden Yeo Chan-uk showed up out of nowhere. Then, Yeo Chan-uk gave Yu-ri a ring, and confessed that he was gone because he wasn't able to complete his CSAT due to a stomachache, left, trained in the mountains for 2 years, and came back with a handmade ring. So now they're together again.
Don't break the glass work