Why is Sangwoo bad?

Sangwoo is actually a cruel and ruthless individual who kidnaps, abuses, tortures, rapes and kill people, showing absolutely no mercy to his victims, that, he’s totally fine with beating and torturing his victims, even if they’re female and/or pleading for their life, not feeling remorse for any of his actions.

for instance, Is Sangwoo straight?

Sexuality. Sangwoo is a man who hates women and is abusive towards them. He’s shown in the story and confirmed by the Author to be heterosexual. He despises gay people, being homophobic to Yoon Bum by assuming that Bum self harms because his father beat him as a child because of his “homo tendency”.

significantly,

also

• Reference 1
• Reference 2
• Reference 3
• Reference 4