Li Mu Chen was Involved

With the Qi Family's connection, they were able to go enter the airport's security room and go through the footage from a few weeks ago. Fortunately, the footage from the day that Liang Sheng visited Capital City was still in the security's storage.

Through Qi Ming Wei's investigation, they soon found out that Liang Sheng was indeed kidnapped. He was seen entering a quiet corridor and did not come out for a long time until after the elder janitor came to wake him up. 

After rewinding the footage for a few hours, they soon found out that Liang Sheng was taken away from the corridor by a man in a hoodie with a wheelchair. His body was covered with a blanket and his face was covered with a baseball cap. Qi Ming Wei spotted the bag that Liang Sheng was carrying with him and decided to follow where the man went to.

All these while, Liang Sheng did not make a slight move and they can only assume that Liang Sheng was drugged.