here u go
https://chrysanthemumgarden.com/novel-tl/at/
cheater 42 is where season 1 ends and where seasons 2 starts
he isn't, he simply didn't tell wooyeon that he knew that he was yeon because wooyeon was hiding it and he was waiting for wooyeon to tell him first. dohyun is so smitten for wooyeon, everything he does is for wooyeon. the study group was only an excuse for him to be near wooyeon, he always sat next to wooyeon at drinking parties. dohyun rarely smoke around wooyeon, he stayed up all night during the MT, making sure that, that sunbae doesn't think about touching wooyeon.
well there was a misunderstanding about something, yes wooyeon does break up with dohyun cause of that. dohyun legit opened up to wooyeon about everything, like how he grew up and the reason why he didn't tell wooyeon everything. once that gets solved which does get solved pretty quickly, they date again. dohyun cried when wooyeon confessed his feelings to him, dohyun was drunk but he still cried when he found out that dohyun loves him. he says "i like you hyung" which makes dohyun cry cause he's so happy cause he loves wooyeon so much. he told wooyeon that he likes him so much that he doesnt know what to do anymore.
well, much later on they have a fight cause they kept getting jealous of each other. the reason being is that, Dohyun isn't in university anymore so Wooyeon is extremely popular which makes Dohyun jealous which he doesnt know how to express. Wooyeon got jealous cause Dohyun came back to university to give a special lecture and ofc he's extremely popular which makes Wooyeon jealous. they fight and don't talk properly. something really good happens after they make up which i can tell you if u want?

I need spoilers from the novel readers, I beg