Do you think before posting? If it is secret, why would you or I be privy to that secret between those two countries? And if you have a security clearance to state secrets, would you be talking about those on the internet?
Read. There are quite a few threads or sources that contain information. Reading helps you make sense of the world; and it would make your questions more logical. Please start with some background reading on '
Understanding North Korea', and '
China’s North Korea Policy'. I caution that PRC decisions on North Korea cannot be simply understood with just their interaction with the Koreas and the US, especially since their concept of time is different. Often times, American politicians cannot think beyond their term of office, whereas, the PRC's leaders have a different, much longer time horizon.
On complex issues, in a complex region, reading would improve your questions; and raise your credibility. Learning is a choice.