Area of Z

The emotionless high school student was adopted by the family he is living with. He is not only mistreated by his family but also bullied by his classmates in school. One day, he picked up a strange book called 'the second dream' and since then, he entered into a lucid dream of a game world when he fell asleep. Later in school, he found that he was not the only one that had the book. [Original Webtoon](https://comic.naver.com/webtoon/list.nhn?titleId=603311)