There is a rape from the 4th chapter.Then the guy seems excited about being raped (at one point he remembers rape and masturbates). In this story we find a sister completely disturbed, an urologist who seems a pervert/rapist. Really disappointed, There is only one mind disturbed to write that. I don't understand Korean but that's what I think I understood, I don't think to continue reading this manwha.
Ye it does seem it bit creepy. That prostate exam was very rapey and not realistic but them again no yaoi is. They always have rape/molestation scenes so they can get the sexy part quicker. I prefer when there's a build up between the two mc's but most of the time it's kinda creepy and forced. Especially with the increase in alpha and omega yaoi it seems rape is the main attraction.
I find the last chapters not very interesting, I remember how I loved this manga at the beginning, I was looking forward to a new chapter every week, now my interest is quite low, I'm bored. I want to feel the same emotions at first but I think it will not happen anymore... It's just my feeling so thank you to respect and not to attack me, because I know that many still love this manga and I do not judge you. I think everyone can express their opinion (bad or good) as long as it remains respectful.
I find that the brother is more of an omega in his behavior than an alpha, so the doctor may be attracted to omega since he likes this weak behavior. Otherwise I miss the other couple, I find this one less interesting.