该剧改编自林家成的仙侠小说《误长生》，讲述了女主角魏枝和男主角炎越经历坎坷，最终打破了“凤凰涅槃将动荡三界”的宿命，共同创造了壮丽的仙侠故事。

故事背景设定在人间魏国，修仙在这里非常盛行，但对大多数普通人来说，长生仙境始终是遥不可及的梦想。年少的魏枝虽然被视为不幸的孩子，但她的性格坚韧而不懦弱。她勇敢地参加了测仙缘根骨的成人礼。在成人礼上，魏枝所在的三十六人组被鉴仙镜照出凤凰的身影，因此他们被一起送到白鹭书院进行深造。而在书院里，严厉的老师炎越实际上是来自上界的天君，他严苛地对待着所有的公子小姐们。炎越的真正目的是寻找凤凰血脉的继承者，因为传说中凤凰将带来三界的毁灭。炎越要完成的使命就是消灭凤凰，并且这也是他能否成功继位天君的最大考验。然而，炎越由于天律的限制，无法直接干涉人间事务，但他却逐渐对聪明勇敢的魏枝产生了浓厚的兴趣。

The play is adapted from Lin Jiacheng's fairy tale novel "Mistake of Longevity", which tells the story of the heroine Wei Zhi and the hero Yan Yan. The more they experienced the ups and downs, they finally broke the fate of "the phoenix's nirvana will shake the three worlds", and jointly created a magnificent fairy tale.

The background of the story is set in the Kingdom of Wei on earth, where cultivating immortals is very popular, but For most ordinary people, the fairyland of longevity is always a distant dream. Although the young Wei Zhi is regarded as an unfortunate child, her character is tenacious but not cowardly. She bravely participated in the coming-of-age ceremony of measuring Xian Yuan Gen Gu. At the coming-of-age ceremony, Wei Zhi's group of thirty-six people was photographed by the Immortal Immortal Mirror as a phoenix, so they were sent to Bailu Academy together for further study. But in the academy, Yanyue, a strict teacher, is actually a heavenly king from the upper realm, and he treats all the princes and ladies harshly. Yan Yue's real purpose is to find the successor of the Phoenix's bloodline, because it is said that the Phoenix will bring about the destruction of the Three Realms. Yan Yue's mission is to destroy the Phoenix, and this is also the biggest test of whether he can successfully succeed the Heavenly King. However, due to the restrictions of the law of heaven, Yan Yue cannot directly interfere in human affairs, but he gradually develops a strong interest in the smart and brave Wei Zhi.