Honestly... it's fine as long as it's in fiction. Not irl. NO!!
I absolutely shiver at the very thought of sleeping with someone who knows that they raped me AND let their brother do so as well.
That being said, I have absolutely no hate whatsoever towards this manhwa. Matter of fact I like it alot. For once it's the perpetrator who gets reincarnated with past memories intact. I absolutely love the way Seijin handled everything. Hands down to this milf. The story writing is perfect. If one considers that everyone is different and feelings have no logic, one will definitely not find the fault in Seijin's decision.

What would you do if you were in Sejin's situation? Would you forgive?