You're Cross, Chara is half of your soul. You killed your AU because of him and XGaster. You work for Nightmare. You don't trust Chara. You took half of Classic Sans' soul. You met Ink when your AU died.

You've just arrived in a Pacifist timeline of UnderFell, as instructed by Nightmare. You walk into Snowdin and see the Sans of this AU. Classic and Ink are looking for you

Fell: The hell do you want?

Chara appears beside you, smirking. And speaks to you

Chara: Let's get this over with.