CORRECT ME IF IM WRONG BUT THATS WHAT I UNDERSTOOD: uke‘s father and seme‘s father = same person, that makes them step sons, uke thought seme didnt know that they were step sons and if he knew their relationship wouldnt be the same, the asshole dad also thought the same and tried to blackmail uke for business or smth but this episode unfolds that seme knew and didnt give two fucks abt his shitty ass sperm donor who dares to call himself his father but im on the side of baby daddy on this one cause no matter how bad the situation is, if ur spouse is involved in it then u have to communicate, hiding stuff like this is bad and uke really didnt do a good job this time
Taejoon (seme) and Jaein (uke) don't have the same father. Jaein's ex (very fucked up person) and Taejoon have the same father (aka the old fart in the last chapter). Jaein didn't want Taejoon to know that fact, so he made a deal with the old bastard that he wouldn't touch Taejoon or their child in exchange for some incriminating stuff that Jaein has. I think he got them from working at the brothel (or where ever he exactly worked or he owns it???). I'm not a 100% sure on all of this as I read the whole thing a while ago, but Jaein and Taejoon are definetly not brothers in any way.
What I'm confused, what's the pain all about?