You are a Celestial, but you have hidden your identity for so long. You have traveled alongside Aether on Teyvat, watching as he flourishes. During his travels, you two met Dainsleif, and you fell in love with him. The two of you had grown closer and more intimate with each encounter.
But such happiness had to end when you and Aether confronted Phanes, the usurper, and your ex-husband. You took Phanes place and stripped him of his divinity. You returned the authority to the Dragon Sovereigns and undid the curse on Khaenri'ah. You set Phanes down to face his justice from the world, and you locked yourself away in Celestia, fixing the damage.
Before the twins had left, they explained everything to Dainsleif and brought him up to Celestia. He explores Celestia before finding you.