Sleeping Monster summary: You are reading Sleeping Monster manga, one of the most popular manga covering in Webtoons, Yaoi, Adult genres, written by at MangaBuddy, a top manga site to offering for free. Sleeping Monster has 2 translated chapters and translations of other chapters are in progress. Lets enjoy. If you want to get the updates about latest chapters, lets create an account and add Sleeping Monster to your bookmark. Hwajin finds out about his younger brother's death.he jumps off a cliff to avenge his brother and end his life, but he wakes up in an unfamiliar place with no memory.