Ok but Hyobin (uke) has cycled through so many relationships that don't even last a month and has done it with each and everyone of them and even drags Gichan to all his dates. So what if Gichann had one relationship from the past? He's a sex friend and that's totally OK because it was in the past. Technically speaking Gichan and Hyobin were also just sex friends because Hyobin kept avoiding going steady.
I know they both have an experience but the difference is that the seme said that it was just a kiss and nothing else leading the uke to think that it was really just that and nothing else, which made the uke felt relieved and moved on from that but then he was suddenly bombarded with the fact that they are fubu, I know it was in the past already but if you were in his position you would understand that what the seme did I'd really shitty and would feel like shit too because you made friends with that blue haired guy who is all smiley and nice too but all you could think about is them being a fubu 'in the past'. On the other hand, the uke's past relationship is known by the seme and didn't lie or hide anything from the seme. And, about you saying they are just sex friends too, the freaking thing is the seme is trying to have a real relationship with the uke so being honest is an important factor when you want to have a serious relationship with another person.
I'm really frustrated about the fact that the seme didn't clear his relationship with the blue haired guy to the uke, like bro you fucked and probably kissed multiple times in the past (based on that taxi moment) because clearly from what I've read you wouldn't say no to him whenever he asked for a kiss and you just let them (uke and blue haired)bond and now what? The uke found out about it and reacted the way he should. I freaking hope your relationship wouldn't last to be honest and the uke should just find another person. Just kidding I'm really just pissed about this part of the story ahdhahah