What if the final element was never an object at all?

A final encounter with a traditional knotting artisan, Yang Xuefei, reveals a deeper truth: perhaps the last key is not something to collect, but something to be immersed in.

As night falls and intangible cultural heritage inheritors gather for the Chinese New Year's Eve dinner, Kai must piece together what the journey has really meant.

What is the final element missing? Will he ever return to reality?