In the 90s, Leo Lowell was a test subject at a research institute that conducted unethical experiments on people. The experiments were painful, but he was able to endure them because of his friends and a doctor he liked, but he eventually became a discarded test subject by order from his superiors. Feeling betrayed by the doctor he trusted the most, Leo began hunting everyone in the research institute in order to get revenge...

Original Webtoon:
Ridibooks, Bomtoon, Lezhin