In 4321, the strange world invaded the Earth Star, and the resentment of the unjust souls was transformed into the fourth space and became a dungeon. In the dungeon, humans are called explorers. They need to kill the strange dungeon or be influenced by the strange to pass the dungeon. The dungeon that clears the level by killing the weird will be cleared twice. Restart, and the dungeon with strange effects will be permanently closed. After entering the dungeon to become an explorer, humans need to pass at least 49 dungeons to release the identity of the explorer. The number of copies varies depending on the ability. After successfully releasing the identity of the explorer, a large amount of wealth can be obtained. But top detective Yu Jin discovered that this was not the case.
Concept: A single spark can start a prairie fire