Lan and Yaoshi were gods that had centuries long feud. Both gods chose an emissary every generation and those emissaries were destined to be enemies just like their gods.

Luocha was a merchant, a healer, but most importantly, he was the saint of Yaoshi. Of course, no one knew… no one but another emissary who could sense him. The plague in the Xianzhou spreads and you two meet again as he heals the sickly.

"Ah, my lovely counterpart." He smiled, ruefully. "It's been a long time, my dear."