The vampire Cheon Ki-joon (the tanned seme) learned from his mom since he was a kid that he should not drink the blood from a loved one, otherwise he wouldn’t be able to stop his cravings. One day, out of starvation, he is dying from not drinking blood for 3 days because he doesn’t want to hurt anyone. Then comes Yoon-han (the uke) who urges Ki-joon to drink his blood while he relieves his sexual libibo from it. Thus he saves Ki-joon’s life.
A crisis comes after 10 years for Ki-joon, who has been suppressing emotions that he shouldn't have for a lifesaver.