In a mysterious inn at Dunhuang, four expedition group members stationing here await the arrival of friends brought by destiny. Summoned by the mysterious token fragments, five young idols are traveling to Dunhuang with great curiosity. There, they will join the expedition group and unravel the five key puzzles of Dunhuang dating back a thousand years ago. Together, they will reveal the beauty of Dunhuang via the connection between the ancient civilization and the younger generation.