Closers is a huge and popular game in South Korea and it only gained popularity in the Chinese market last year. With Naddic Games getting the limelight, they had recently confirmed and announced on their official Facebook page of their collaboration with a Chinese mobile games studio (but no mention of the Chinese company). Their collaboration will bring together an RPG of the Closers IP onto mobile for the Chinese market that was announced last month.
This means that the mobile version of Closers will not be a rip off from China, but instead a genuine production alongside with the original developer, Naddic Games. However, it was stated that the game will be released in China but it was not revealed if the game will be released for other regions, or better yet, global.
Below are some gameplay screenshots: