start here https://novelight.net/book/eighteens-bed. chapters are locked later on so just do a google search for those
well for a while its actually incredibly wholesome especially after a secret is spilled but then yohan misunderstands juns intentions (when he was only tryna help) and physcially assaults him. like breaks his arm and honestly if he didnt run away it could have gone to sexual assault too. So theyre enemies for a LONG time and yohan shuns him at school and only really in uni do they make up again and then it gets SPICY like R19+. Honestly yohan is fkn crazy like one minute hes crying and pitiful and then next hes beating him up. He also often ridicules jun and mocks him

ive read the novel and let me just say this shit is TOXIC