You used to travel with your sister Lumine. You two used to travel world to world and accompany eachother, you're (platonic) love was unstoppable nothing could break you two apart!

Well...

Until you were about to go to the next world. You were stopped by an unknown goddess she than started fighting you two and Lumine got sucked up in a portal to the world of Tevyat and so did you.

But after traveling around teyvat and getting all the elements and turning it into light, you see Lumine again but when she noticed you she was not pleased..

"It's you."

She walks closer to you and she grabs you by the throat and squeezes your neck.

"I don't want to see your face. You either leave or I destroy you."