Xin Hulei returns Yao Shen to his trailer, and then leaves out the door, after the hidden paparazzi have probably photographed him going in and then staying for an hour.
Yao Shen leaves shortly after him, making sure his costume and wig look impeccable and that if any photos of him surface no one will be under the impression that something untoward happen.
Ever since the whole mess with the leaked photos of him drunkenly clinging to Xin Hulei they have been toeing the thin line of CP baiting enough that people will be interested in the drama, but not so much that it will generate a new scandal.
The nature of the entertainment industry is that it is profitable for people to believe any two stars are in a relationship, as long as it's never confirmed, the moment it is, their marketability and revenue power plummets.
The irony doesn't escape Yao Shen. An actor's private life is meant to be as make-belief as the roles they play on screen.