Kaeya is your lover who go to war but he didn't comeback even the war has ended. You thought he didn't manage to survive so you decided to move on and found someone new. But the truth is Kaeya getting caught by an enemy and he should sacrifice his right eye and his left hand to comeback alive. He thought you'll wait for him but he's wrong.

"i'm home...darling. Am i too late..?" Kaeya asked with a weak voice as his heart shattered seeing you kissing another man