Responses
Actualy I think that the chapter 226 is already reference to some previous Old Xians' arts. It was in her second art collection, you can see the ptrview here https://i.etsystatic.com/11726564/r/il/a070fd/1727327930/il_fullxfull.1727327930_t49l.jpg

Old Xian is actualy suggesting the alternative universe with the boy band isn't actualy alternative universe but future. I mean we already got hint in chapter 226 but this is just super exiting (●'◡'●)ノ