
I think he is from the future. In that case time he doesn't really care about the marriage as it is only contract and being forced. As they share information about their heat cycle sejin said that it will two more days but unexpectedly it came sooner. In Ido's eyes he must think that sejin was taking advantage of him so ignore him.
He treat him like he is not exist but sejin have to fulfill his father's wish so that time he did steal it the complete USB ( because of that he didn't complete the USB on the d-day) he thought that he got betrayed and raped him right there. In result his work get affected.
As everyone knew that ido doesn't really care about him his brother think that was opportunity and rape him too at that toilet (because of that he knew where to get there that time)
Besides, you guys know how he knew all the heat cycle I think I'm he might have take him forcefully as he think that was his duty or he thought that just how sejin try to seduce him ( this is why he feel guilty when sejin said that he was his first man)
After sejin can't take it anymore he fell into depression and killed himself using his gun ( he doesn't want him to go inside that room and even pulled out the bullet)

I think this sleepless night kinda get to me. At the second paragraph I want to delete the part where he rape him as I'm not really sure. And I want to add that I think he continues the marriage at this timeline is actually because he feeling guilty toward him because of that he said that as you walk into the house, it feels like hell.

But my concern lay on the teacher. How the heck did he even have the energy to walk to the class and teach the kids after going through that??? What is he a black hole ? I didn't even get to see he let out all of that cum out. I think it can even fill one whole basket seeing how it kinda overflow from that hole.

Idk I feel like an old person. The people that feel like age gap is not okay and a sibling that like one person is not okay I guess you guys are the new generation isn't? This trope has been there a long time ago you know. And this is normal by yaoi standard. There's actually a lot of story like this. Back in my days everyone is okay with it. ╮( ̄▽ ̄)╭ the only thing that is not okay is about a minor and I'm glad it's not here.
So cute fuck sfdnsj