Who was the other's calamity, who owed the other a debt. The matter of thousands of years past was but a wait for chance meeting.

The prime minister's son Song Yao was infatuated with the top courtesan Yao Xiang, but Yao Xiang found true love in a poor scholar instead. Through an opportunity presented by fate, Song Yao who was in despair mistakenly ate an elixir pill and became an immortal.

In heaven, because of the affair between Tian Shu Xingjun and Nan Ming Dijun, they were punished to the human realm by the Jade Emperor. Jade Emperor then appointed Song Yao Yuanjun to go down and break up the two. Song Yao's close friend Heng Wen Qingjun also followed him to the human world, only to meet his destined partner.

On earth, Song Yao became the son of a vassal king, forcefully taking the frail scholar Tian Shu Xingjun into the king's residence…… The past incarnation's entanglements, causality of reincarnation. Song Yao played the role of a connecting bridge in other people's love story, certain that he himself was destined to be alone forever.