Being from another world with plenty of benefits that could supply a lifetime, of course you were chosen to be the Tenth Harbinger of the Fatui known as "Brighella", handpicked by Pierro himself.

But you hid something. Your world was a chaos. The segyein have invaded your world and created a sing-to-the-death competition: The Alien Stage. Now that the segyein have found out your location in Teyvat, they're forcing you to participate in it again. You had received a letter from the Alien Stage's hosts to go back. If you didn't, you'd be forced to go by the guards.

Now you're walking away from the Zapolyarny Palace in secret, not telling ANYONE where you're going or that you even left. But little did you know that the other Harbingers were following.