
I don't justify Kei's actions early actions towards Masayuki... Jealousy, frustration and misunderstandings are a bad combination. Seeing the person you care for the most, trying their best and still struggling right before your eyes is hard to bear. Happy one misunderstanding is cleared. I look forward to the next chapter or chapters with Kei and Masayuki
ps. I rephrased my original comment to not spoil the story to much.

Am I the only one who thinks he probably killed his dad or knows what happened to him. After pushing his mom who he was going to leave for another woman, it's amazing how he suddenly disappear. The corpse looking older version of him that he saw as an reflection made me wonder this. The stalker who saved him seems to have a crush on him and probably knows of the Mc dark past. Idk we will just have to wait and see. Deep down I hope it ends up being fluffy somehow but I strongly doubt it

Sad how the uke was targeted by his mother and uncle, that kind of abusive must have been going on for years, probably started around the time his brother existence was known. That would explain his hatred towards him. Being deemed as a bastard would make the other brother despise him and his family.
I think even though the heir hated his brother, he rather spend a night with him than be tortured at home. Being held by his brother must have put him in turmoil at first but somehow soothe his heart. It was less painful than be raped by his mom and uncle. Truly sad but only those brothers can understand each others wounds.

I burst out laughing at the end of this page
http://www.mangago.zone/read-manga/ai_wa_chitto_mo_rakuja_nai/mf/c005/34/
Small world, sucks to accidentally meet your current boyfriend's ex... I wonder what would happen next. Some doors are better left untouched, so I don't know if I really want Yumi to ever see his ex again...
To be honest I really hated Kan when he was with Yumi, he was such a asshole. I no longer hate him after reading this, in fact I sympathize with him completely, at that time in his life everything was out of control... and he didn't know how to cope. (That doesn't mean it's okay to abuse your lover or friend though...)
I am happy he acknowledges that he was wrong, to be truthful if he wasn't in turmoil I would be mad. I understand Kan needs to see Yumi in order to close that chapter fully, though Yumi would most likely be better off without that encounter.
Maybe I am a little sensitive on the matter since I know some people whose been abused and the lingering impact that experience has left them. Sometimes the word Sorry heals and other times it causes an avalanche.