Song Yao accidentally became immortal after consuming a heavenly elixir and has spent millennia living without much purpose. The Jade Emperor finally orders him back to the mortal world to oversee a romantic trial between two immortal lords, only to reveal that Song Yao himself must interfere by winning the heart of one participant, Tianshu Xingjun. What looks like someone else’s destined romance quickly becomes a test of Song Yao’s own loyalties and feelings.