Christmas episodes isnt a random story tho, its a separate time skip series. This year will probably be talking about HeTian's absence/leaving soon. Also wym by this years lack of development on the story ? /gen. This year was primarily focused on Mo's and HT's story and rs development..
My guess for Christmas special is:
1. We get a random story. Same as it was in 2020 :(
2. We get something that will throw a light on whats going to happen in next years development.
This guess is due to this year's lack development on the story. Kinda feel this year was old Xian "vacation".