Namwoo ends up kind of chasing Si-eon from the start, he gives him money after they have a handjob together whilst Namwoo's drunk (whilst he's drunk he complains about being broke so he demands for money and Si-Eon's rich so he just gives him some) and then from then onwards Namwoo feels indebted to him for the money. They then keep meeting up afterwards because they realise they get along, and Namwoo eventually falls for him and they end up together. However their relationship kind of hits a stump because Si-eon doesn't actually love him and he has this thing where he's just happy as long as the person he is with is happy. He's somewhat unable to be selfish in love and do what he wants, he just wants to give and never take or ask if that makes sense. Namwoo feels frustrated because he feels the love is one-sided + he's always taking from him, and they end up splitting (I think) but Si-eon eventually realises Namwoo was different from his abusive ex (who Namwoo encounters actually and is part of the reason why Namwoo becomes frustrated at Si-Eon because Si-Eon's ex highlights this issue to Namwoo of feeling a lack of love from Si-Eon which had led to him hitting Si-eon in a fight) . Si-Eon basically realises he actually does love Namwoo and this is the first time he feels genuine grief for what they had after they broke it off bc he's had some bad relationships before and they end up back together. Essentially Namwoo (I think) acts 'selfish in love' all the way till the end and ends up chasing In-Seo after they broke it off and In-Seo learns to reciprocate these feelings and feels the same. There's a hint thrown in that the angry ex is in a potential relationship with a hoobae (I think hoobae?) of Namwoo because we get shown this panel of them together and they have rings on their hands but the author's yet to confirm if she even has plans for this continuation.
my apologies for the ramble, hope you understand it

I saw a comment saying this was already finished so can someone spoil it for me please. I need a general summary from start to finish because I forgot what happened already