She was sick. He was completely clueless. She chose to let him go. He chose to leave.

Yoon Saera is that girl who everyone thinks is a witch, a monster because of her abilities.  Kim Jongin is that guy who everyone absolutely adores. When two people from two totally different worlds meet, what would happen? 

I was filled with sins not because of what I did but because of what I am. I never asked for this from the beginning but it was my fate, my destiny to forever be tied to the Sword of Sin otherwise known as SoS. I feel apologetic because I know at the end of this journey, I will have to leave him. I wish we've never met so that you wouldn't be in so much pain. I'm sorry..