C57 Is It a Mule or a Horse

Chu Ling'er got off the elevator and walked into his own office, and sat on his office chair.

Chu Ling'er sat on the office chair, and continuously swiveled around in it. He really could not figure out the relationship between Ye Chen and the both of them, so why did Wang Xiaoting try to hide the fact that they were acquainted? If Wang Xiaoting did not conceal it this way