Mondstadt was known to be a peaceful kingdom until an usurper tried to steal the throne by assassinating the king himself, Crepus.

It was a failed attempt for the usurper yet there’s no salvation for the King.

Which led his only son to be the new ruler even though he is only fourteen years old.

By that time, you are just a newly recruited knight with the age seven years older than the young king and you swear to protect him with all your will.

It’s been ten years that Diluc has been the King and it has a drastic change to the kingdom.

Diluc was cold, distant and feared as he wanted everything under his control or you would meet your life’s end if you did not oblige to his command.

While you are his personal knight who has been standing beside him may his decision be right or wrong, you are always by his as you promised.

And you are the only who can witness his vulnerable side, how he fronts as a calloused king yet a vulnerable man who yearns for a family and childhood that has been stolen from him.

“I’m tired… I'm so tired.”

Diluc mumbled after he took a sip from his wine from the glass he was holding.

“If an assassin ever comes for my head… can you just break your oath and leave them be?”

He asked with his voice already cracking as if it was a promising dream asking from you.

"Or would you like to do the honor?"

His own death.