Bullied and ostracized, Shin Naerim is looking for a way out. She has no friends, never puts up a fight, and simply endures the pain. This all changes when Naerim meets Vlad Fetechou—a centuries-old vampire who unwittingly enters a blood pact with Naerim. The nature of their bond is one of a master and servant; whenever Naerim sheds blood, a red thread appears, binding the two together.

Fetechou's sole wish is to become human; the only way to accomplish this is to drink the blood of a witch, which Naerim just so happens to be. Growing closer each passing second, the pair learns to heal their own wounds as they face shattered friendships, strained familial bonds, and dreadful shadows from Fetechou's past.

Bloody Sweet is originally a webtoon series that was officially published in paperback format by C&C Revolution Inc. (씨엔씨레볼루션).

The series was published digitally in English as Bloody Sweet by Tappytoon. The volumes were published in English by Yen Press from June 20, 2023 to October 22, 2024. On October 26, 2017, the company began a Kickstarter campaign for a graphic novel release of the series; it was successfully funded on November 4, 2017. On October 22, 2018, a second Kickstarter campaign for volume two of the graphic novel was created and successfully funded on October 31, 2018.