A supportive training team has been set up just for Liu, including a doctor who provides 24-hour medical support.

Sun said the life of an athlete is somewhat boring, and Liu can never go shopping and hardly ever leaves his home.

"Liu is always in the public eye, both in China and overseas. I am trying to adjust his intense timetable and let him take a break," Sun said.

Sun denied stopping Liu from having a girlfriend.

"I will never be against him having a girlfriend," he said. "But what I would like to suggest is that he doesn't find one now, while he still faces so much. To my knowledge, he doesn't have one at present."

When asked if he has found a good successor for Liu, Sun said he has several potential teenage athletes, but currently his focus is still on Liu. Training a female athlete is an option, he added.

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