Yeon-woo is a “lucky pervert(?)” who keeps accidentally doing pervy things. One day in an alley, she slips up again with a girl her age named Hayang—and hears something shocking from her: “If you let me taste your blood just once, I’ll let it slide.” As Yeon-woo keeps running into Hayang—who seems to be a vampire—on and off campus, warm, fluttery feelings start to grow inside him…