In an ancient world where gods, demons, and mortals live side by side, the immortal Chang'er and his apprentice Xiao Liang keep to themselves in the Floating Light Cave. Their calm ends when the demon king Dapeng comes after them. The timid Xiao Liang has no choice but to join forces with Jiang Cheng, a clever and cunning scholar, and Chongming, a resolute and stubborn monk. Together they set out to find Cloud Dwelling, the legendary home of the immortals. The road brings hardship after hardship, moments of romance, tests of friendship, and brushes with death. All the while, a vast conspiracy involving powers from all three realms takes shape around them.