cus of the blood duh,he needed the blood but later fell in love
It wasn’t just those people Joohyun killed, he also tortured and murdered others while searching for Chi Hwan
A lot of people seem to have missed details in this story because they were only quickly mentioned once. The passage of time is very quickly months of time in this story. It's not been a few days or weeks. Half a year passed before you're halfway through the story.
And like Txbatgirl said, Joowhan did a lot worse to people after his rapist was murdered in his attempts to find the ML again.
Nice, but I still don't get why he would quickly fall in love with Sooin, It's more reasonable to go back to his first love, afterall he just decided to let the others die in order to save him. just my opinion LOL