hidden legend story synopsis

Jo is in April’s house. Jo and April were best friends since primary one.
April asks Jo to follow her to the balcony. April starts to speak in a weird manner and talks about some Chinese legend. Jo felt that it was weird but continued to listen until she felt tired and doze off…

The next day, Jo woke up and found that April was missing. Jo found an ancient map part left behind from April.

This map part lead her to DunHuang and begin her adventure of searching…