I knew it, he raped him in the past. And this really hits hard because when you do something bad you always wish to turn back time to never had done it. But this time, it was something so horrible, that not even turning back time Sejin could forget. How to proceed, then? Certainly, it can only be forgiven by Sejin if he so desires, because in no other way is rape and mistreatment forgivable.
I wonder is when everything changed, when Ido started to love him and regret it. Because I feel he has tried at least 2 times already to keep Sejin alive, and failed. ╥﹏╥