"Connect the World: JEFF World";; JEFF World is a user-participating metaverse platform that connects as an avatar, rebuilds the city through various missions, and expands the digital virtual world. At JEFF World, users can own 3D LAND and ‘My room’ in Crypto Valley by having LAND NFT. Crypto Valley, the first utopia city user will meet, consists of 9,725 LANDs, and a new area will be opened through user activities in the future.