The two become friends in May 2014 when Aamir had gone to China, where the dubbed version of P.K was releasing. Wang was the actor who dubbed for Aamir in the Chinese version. The two became friends and have been in touch since then. Wang made this trip only to meet Aamir and see how he works for a project.
As fans might be aware, P.K directed by Rajkumar Hirani broke box office records in China. It made 100-crore from China, which was a record for an Indian film. The Hindi film that held the box office record prior to P.K was Dhoom 3. So, the actor was quite a fan base in China.