The participation of the developer community at public blockchain is one of the important factors for success. Since the design of Klaytn, Ethereum that is the strongest developer community is selected as base code considering this, and by protecting solidity compatibility as smart contract language, it is supporting original blockchain engineers to transfer to Klaytn easily. Also, Ethereum Toolkits also tried to protect compatibility so that it is able to drive at Klaytn with a little bit of modification. In contrast, tools developed for Klaytn can also be used at Ethereum with a little bit of modification. Through this, we hope there are more opportunities for two platforms’ community to exchange with each other.