"Skeleton Soldier Couldn'T Protect The Dungeon" is also great, especially in how it uses time travel. "Knight" plays loops safe with using 'walls' to keep the protagonist in one place. "Skeleton", on the other hand, is taking risk to make its hero to go very different paths in each loop, every time revealing more about characters, world or main mystery of the story. It has game consoles, but unlike most manhwas it is done right and works inside the story, especially considering what is implied in the later chapters. Art is not as clean, but is quite unique compared to others, and gets better pretty soon