After learning that his longtime crush is tying the knot, Jeong-in finds himself in a one-night stand to help mend his shattered heart. He recalls an intimate encounter with an attractive man, but he is puzzled by the peculiar design on his tongue. This man reappears and reveals that he is a vampire who has imprinted on Jeong-in. "The imprint will keep you feeling thrilled. So... will you date me until we discover a way to reverse it?"