development of random chatting service which has similar form like Korea random chatting service 'zultalk' and 'simtalk' but has more convenient UI, motivating features to encourage that people chat in uTok. this service can restore the previous chatting in case either of people is disconnected by any chance. Actually this is an experiment to know how existing chatting users in other services can be affected to move into uTok provideded discriminative features are offered in red ocean market. And anyways I really wanted make an instant messenger or SNS messenger. But there're already quite huge services like Kakao Talk, Line, and so on. So I've decided to go another way.