Penglai Immortal Island: Mu Lingxi, the secondary daughter of the Mu family, has her father's heirloom, the Canglan Sword, snatched away by her cousin Mu Wanqing, and is cast into the ocean after her spiritual roots are destroyed. In the desperate situation, the soul of a true dragon of the nine heavens falls into her sea of consciousness, using its immortal dragon energy to help her rebuild her dantian. Entering the Penglai Pavilion with the body of a four-element spiritual root waste, she tames the Iron-Feathered Thunder Eagle, contracts the divine beast White Tiger cub, subdues the fox demon Fei Yan, and even becomes sworn siblings with Crown Prince Ye Junlan. With the three-year agreement hanging high overhead, she rises all the way against the odds, vowing to defeat Mu Wanqing at the grand sect competition, take back the Canglan Sword, and prove that even a good-for-nothing can soar across the nine heavens.