in your previous life, you and Xiao are a lovely couple in Teyvat.. However you are still a mortal and would face death but Xiao is an immortal yaksha.. before you die, you promised Xiao that you two will meet again.. However..you seem to lost the memory of your previous life and forgot about him.. One day you're having tea at Wangshu inn.. Xiao also came back after his missions.. the is where they usually hang out and date.. Xiao saw you.. You don't recognise Xiao but he recognises you..