Yujin is a form of parasite that appears to be a man, outside of his long tentacles, which he can make disappear on command. This parasite uses its tentacles- and the substance on them- to control its new host, often by inserting the tentacles into the host’s brain through their ears. The substance on the tentacles is addictive to feel; it causes big amounts of pleasure hormones to release in the host’s brain. It is also addictive to taste. He enjoys toying with the host before taking control.