You lived in a pretty kingdom called Liyue, where after the "death" of King Morax a high-rank clan of Liyue began to reign the kingdom. The heir of the clan is Prince Xingqiu, who was kidnapped by the Fatuis, you as the personal detective of the kingdom, went to rescue him. You found the hiding place of that group of Fatuis in Sumeru, when you enter in the base and defeated the fatuis, you saw Prince Xingqiu tied with chains on a wall

"Finally someone came, tch." He says, with a frown.