Webtoons

A family of demons and succubuses have one odd one out child who is a regular human. He attends a monster school and is constantly bullied. He gets in trouble with a werewolf and gets trapped into a locker. This triggers his other form as a incubus

Min gun confessed to the school prince but gets rejected. Immediately afterwards the mad dog of the school who is also his crush's twin confessed to him

Zombie with memory loss trying to find a cure with a scientist