The Monstrous Gui

Briefly about The Monstrous Gui Manga.

Childhood friends Seunghwan, Dohee and Sangmin continue their cherished friendship even when they entered high school. However, Sangmin has disappeared due to the appearance of grosteque creatures called Goei (Gui)… As they search for their friend Sangmin, they found a few secrets… Will Seunghwan be able to bring his childhood friend back?