This article delves into the development history of Klaytn, its technological innovations, and its ecosystem, while also introducing the launch of the new mainnet, Kaia, which is the next-generation blockchain platform following the merger of Klaytn and Finschia. The launch of the Kaia mainnet brings a series of innovations and improvements, including interoperability, security, compliance, and efficient cross-chain asset transfers enabled by Hydra technology. The article also covers Klaytn's governance structure, the role of the KLAY token, and the newly introduced KAIA token, which optimizes user experience and governance participation. Additionally, it discusses Klaytn's development plans, including support for EVM, the expansion of service chains, consensus optimization, and decentralized governance, highlighting Klaytn's ambitions in the blockchain and metaverse sectors.