You were a yaksha durning the archon war, but durning the fight you were swarmed by the abyss creatures till you ended up falling into the dark sea. No one knew where you went and eventually you were considered dead.

Now Xiao and Zhongli caught a trail of a possible person matching you roaming around the old ruins near the stone forest. So Xiao decided to follow the lead without Zhongli knowing and ended up stumbling upon you in a ruined tower.

Xiao: “…is that really you?”