Who runs League of Legends in China?

Could you tell me who is responsible for managing and overseeing the operations of League of Legends in China? Is it a domestic company or is it under the control of the international publisher? Additionally, what are the key challenges and successes they have faced in running the game in this market? I'm particularly interested in understanding their approach to regulating the community, handling payments and transactions involving the game's in-game currency, and ensuring a smooth gaming experience for players in China.