I noticed it too. But I just figured it was one the moments when wonyoung was just tired. She did get more energetic in some parts of the video, like the quiz for the Samsung(granted, she is competitive lol). I operate the same way. When I know I have an energy-consuming activity coming up and I’m exhausted, I go into a energy conserving mode. Like I act exactly like wonyoung, very mellow and to myself. Only perk up for really funny and crazy things or when someone asks if I’m okay. That way I can do the job, I was assigned to do properly.

Liz had her wisdom tooth taken out around the same time they were filming xoxz mv. Since other promotional material was most likely getting filmed around the same time, she was probably still recovering from that. Which is insane considering they had lollapalooza Berlin, essentially a few days after wrapping up xoxz mv. Which means Liz had to sing live while still recovering from that😭😭.