A male demon from the streets gifted with excellent medicinal and observational abilities. Rejected my medical academies for his background, he decides to pursue his own evil medical career path.

age: 24 years old

birthday: April 14

blood type: type AB

height: 177cm

weight: 68kg

favorite thing: experimentation, dissection, medical practice

dislike: fluff, office work

Background: Born in a back alley and raised on the streets, Jack grew up despised by people. But Jack had a special ability. That was incredible observation. Thanks to this observational skill, Jack was able to find loopholes and weaknesses in things, and he wanted to use this ability to become a doctor. However, he is refused admission to his school because he is a demon from the streets. Deeply disappointed, Jack satisfies his intellectual desire by teaching himself medicine, but begins to become increasingly distorted. Then one day, a rumor circulated nearby. A highly skilled demon doctor had the observational ability to detect any disease with just a single look. However, because his personality was so eccentric, it was rumored that he was a crazy doctor who would cut people's bodies apart.

It was Jack. Everyone was in awe of Jack's horrifying and radical treatment methods. Nevertheless, because he does not discriminate between patients and immediately identifies and fixes weak points regardless of people or objects, not only patients from the underworld but also officials and high-ranking nobles from the kingdom who have heard rumors begin to visit them. Orca, who was one of the guests, even agreed to provide Jack with medical tools from this world. Can you guess the extent of his abilities and skills? As Jack became more famous, the more strange rumors followed him. It was possible to hear difficult rumors, such as people who had hoped to receive treatment from him suddenly disappearing or dying mysteriously. Although there was no special evidence, the suspicion was almost certain, and eventually the investigation into Jack began. As a result, it was revealed that Jack had been experimenting and murdering numerous people, and the government forces tracked him down.

Numerous government forces and investigators tried to catch him, but Jack always managed to escape just in the nick of time. One time, when Jack was surrounded by an abandoned building, he escaped by collapsing the entire building. As these rumors spread, he became more and more famous. But his life as a fugitive did not last long. During his time as the Four Emperors, Lin began tracking him for a long time, and eventually, with Mir's help, Lin succeeded in capturing Jack. Lin tried to execute him, but Pascal, the emperor at the time, imprisoned him, insisting that he use his abilities. Jack, imprisoned deep in a dungeon, spends his days searching for weak points in order to escape. A demon with deer horns appears in front of Jack, who is locked in solitary confinement for killing numerous prisoners. It was the demons who were the mayor of Hydripper.

When the Staghorn Demon asked Jack to cooperate with his plan in exchange for his escape, Jack realized that he was lying and tried to refuse, but he became curious about his plan and cooperated, and thus, he and the Breast Flame Demon. You will get out of prison.

Evil Genius: Undoubtedly he's a smart guy, the only reason for being rejected by medical academies was because of his demon and poverty background.

Evil Wears Black: From his black suit to his dark boots. Becomes evil once he enjoys his horrible experiments and evil medical practices.

Good Wings, Evil Wings: A sinister psychotic demon with a pair of dark-greenish wings pointing downward.

Mad Doctor: Fitting this trope perfectly when he cunningly experimented on patients and even ended up killing many.

Slasher Smile: His creepy smile definitely gives away his true intentions of his thirst to find his next victim.