During the Mid-Autumn Festival, graduate student Hu Yang reconnects with his former classmate Nan Xiaoyan in their seaside hometown. Their growing relationship faces unexpected challenges that test their love and resilience.

After breaking free from a millennium-long imprisonment, the Black Dragon Ye Ying escaped, seized the Golden Dragon's magic power and gravely wounded the old Dragon King. The new Dragon King Fu Xi ventured into the Demon Market to seek the legendary Demon-Subduing Sword in a bid to reclaim the Golden Dragon's magic power. However, he fell into a cunning trap where the sacred sword was briefly recovered only to be lost again. Ultimately, Fu Xi tapped into his latent potential and reclaimed the old Dragon King's Golden Dragon magic power.