Metaverse is a tenacious, infinitely-scaling virtual space designed with its economy and identity system. This concept has been booming since 2020 due to the development of Web3.0 technology, NFTs, Play-to-Earn games, and infrastructures. Projects like Decentraland, The Sandbox, Roblox remarkably demonstrate the potential of the metaverse. Currently, the market cap of the metaverse is $30.7 billion, which is expected to reach $280 billion in 2025 with the development of new technology and the growing demand for the connection between the real world and the crypto world. It is believed that we will be connected to the metaverse all the time, extending our senses of sight, sound, and touch, blending digital items into the physical world, or popping into fully immersive 3D environments whenever we want.