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“The one who violates heaven’s principles, Hong Siyoung. Ever since his birth, Siyoung has only seen everyone in the world in the form of sin. Then one day, Cha Cheong, who transferred to Siyoung’s class, seemed to already know about Siyoung who can see the sins of people. She tries to persuade Siyoung that he has to deal with those who have become ‘sinned souls’ due to their accumulated sins in order to solve his problem…… Will Siyoung be able to be free from his karma?”

Here are the key components of our story: two unusually beautiful boys (known only as Big Master and Small Master), an abandoned church, a blood-buying business, and a homeless young girl named Hansoo – who has unwittingly contracted herself to participate in said business. Big Master wants Hansoo out of the church as soon as possible, but it turns out that each of these characters needs something from each other. Big Master needs customers for blood (and Hansoo’s blood asap); Small Master needs a link to the human world, and any way to aggravate Big Master (read: Hansoo); and Hansoo needs to keep away from Big Master long enough to stay in the church until she can afford her own place. It seems the boys might have a lot of time on their hands, but how long does Hansoo have to figure out what she’s gotten herself into?

Hyeongoh, the first place student at school, is disabled and has a knack for getting ridiculed by the school's bullies. With no help and no way out, he finds himself in a despairing situation…until someone appears to stand by his side!