Note: this manga is not BL. Don't tag it as such.

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?