
Ok so for the people who are confused, the uke had trauma related to his father , besides the dad killing the mother , the mc wanted and yearned for his father's approval, so yeah he had daddy issues. The doctor in his own way suggested to help him get past it . The doctor has a secret therapy method, he doesn't suggest it to just anyone but for the people he thinks needs it. The uke feeling guilt for his mother and daddy issues, wanted to be punished for killing his mother ( wich he did not) and praised ( as getting approval from the father) , so yeah the sessions worked , and the uke knew that this was not about having feelings for the doctor nor the people he was sleeping with, but it was for him to break free from his tiny shell, and finally be free. It worked , and that was the doctor's whole purpose of this kind of therapy. No feelings attached no unnecessary love drama, this was solely work and therapy , both sides knew that , that's why they didn't have any trouble ending it when the patients got better.

So basically the shell is the house he broke free from his father now he has to break free from the house where his mother died in where all his sadness began, so from what understood, the step bro understood the brother , threatened the father to take his position and finally fulfill his revenge, as for the brother he decided to leave all of it sunce he never felt part of it to begin with. So he either had gone abroad or somewhere else to have a new start, or he killed himself , it s like an open ending
For the people who want to read ep 18 and 19 you can find un in mangaowl
Thank you !!! T.T
doing god’s work huh tysm TT