This vid was taken and posted by Rocco Liu (GQ China editor-in-chief). Or, Xia Zhiguang, an introvert at a party. Tian Jiarui, sitting next to him, is, apparently, an extrovert but he stuck with XZG throughout the event.
Hehe, no wonder XZG and Huang Junjie got along so well, two introverts preferring to sit at home and just have their peace and quiet, thank you very much.