Chanyeol, a sorcerer, decides to use forbidden magic to survive in a world where magic is dying. Through dubious means, he “marries” Kyungsoo, another sorcerer. Chanyeol is just using Kyungsoo as his personal blood bank; but his plan backfires when he begins to fall in love with Kyungsoo and contracts the Hanahaki disease as a result of his unrequited love and unexpected feelings.