被封在山中五百年的庚辰仙府师祖司马焦（陈飞宇 饰）与意外来到修仙界的廖停雁（王影璐 饰）相遇后，被其无欲无求的“咸鱼”本能降服，从此廖停雁开始引导司马焦步步向善，成为了改变他的人，过程中他们萌生情愫，在仙府、魔域和人间经历了一段跨越三世的爱恨纠葛，最终两人选择守护爱人，维护三界太平。 该剧改编自扶华的小说《向师祖献上咸鱼》。

Tour guide Fang Yuan who has no passion for life, met an unfamiliar girl on his birthday. The two had a happy birthday by chance...on his birthday one year later, Fang Yuan once again met the robot who looked exactly the same as the original girl on the first day