Childhood friends Seung-Hwan, Do-Hee and Sang-Min continue their cherished friendship even when they entered high school. However, Sang-Min has disappeared due to the appearance of grosteque creatures called Goei (Gui)… As they search for their friend Sang-Min, they found a few secrets… Will Seung-Hwan be able to bring his childhood friend back? (Source: Naver, translated)

**Original Webtoon:** [Bomtoon](https://bomtoon.com/comic/ep_list/akdmsxls78), [Ridibooks](https://ridibooks.com/books/1434001351), [Lezhin](https://www.lezhin.com/ko/comic/mountain_school)