since you asked!
kim youngwu was the one who sent the barely legal dude, dohyeok had no idea about that guy's age. dohyeok was also not planning to rape anyone, (sex-crazy) people like him often use drugs that act as stimulants for arousal, so he offered those drugs to siwoo. but he was sleeping and drunk anyway, so he couldn't have forced anyone even if he wanted to.
although you say you that you're not justifying siwoo's actions, you kinda are, with the excuse of karma. no one asked siwoo to act as a saint and take revenge for the 20 y/o whose existence was never even known to dohyeok, but he did, that too with rape. under no circumstances is rape ever justified, even if the victim is a manipulative and coercive guy like dohyeok. it explains NOTHING about the situation, and everything about siwoo being as bad as a person (maybe even worse) as dohyeok.
there are plenty of reasons to like him, and that doesn't necessarily have to be because he is an SA victim. he never hit on his secretary even though he was totally his type, small and cute. he is a total professional at work, and doesn't mix work with his personal life, unlike the main characters. even after he went through a traumatizing event like that, he continued to go to work with zero emotional support. dohyeok kept working, strategizing ways to get kim youngwu, and maintaining his sex life, all in a balance. he started developing feelings for siwoo when he held his hand at the elevator, while suha started catching feelings for jiwoon simply because he saw him half-naked. dohyeok's character has more depth and layers to it than all the other characters combined, so it's obvious that he has fans, not to mention his cute face and the beauty mark. hope that helps
I dont understand how anyone could be a dohyeok stan that’s actually insane to me. Siwoo did rape & drug him in the beginning yes and i’m NOT JUSTIFYING that but that was dohyeok’s karma he was planning on doing the same to a random youngin and Siwoo found tht out which EXPLAINS why he did those things to him. How can anyone forget everything Dohyeok has done? All those things he did to Suha, Director Park and now Siwoo. Hell no!