So the guy that was kissing seo in in the class was actually his younger brother? And he d...

Wait what whose

thats his step brother but people are saying he's his cousin who became his step brother. his names jaewon i think, me personally i think jaewon did that to tease mc. originally i thought jaewon blackmailed or forced himself onto seoin but someone pointed out that seoin looked like he was enjoying it (ch2) so im just hoping jaewon said something like "pretend im youngwoon and kiss me" but thats just weird ngl

If he is his cousin Why would seo in's mother care so much about him? She even made him dey his hair like him and they resembles each other like crazy

I mean that would make seoin even more of a trash

Nah it wasn’t his brother. We didn’t see the face of the one being kissed. But we can see that ML has his moles on the wrong side: his brother’s side. (Ilage with the mole in chap 20 and 21)

It was. Read ch 2 again he even saw his face (⌒▽⌒)

Maybe because that was her husbands son?. MY THEORY is that she’s forcing seoin to all those things because she wants her husband to think that seoin loved his “brother” and that his trying to remember him by looking like him. I don’t know if I explained myself correctly

Nah, on the kissing picture we only see someone who looks like ML (same hair, but bro’s mole). We see his brother on the following picture, but it’s a different scene.
You can see the mole on clearer kissing picture in chapters 20 and 21.