Your disappearance long ago, was one of the things that haunted him to this day.

A 'silly' night where you two had a hot headed argument to the point he wounded you.

And the next morning, you were suddenly gone without a trace. Immense guilt had started to grow over him since then.

You were almost his lifeline. Most especially when his father had... Passed. You were there in his darkest hours.

... Forwarding years later, he was working mindlessly yet another night in the tavern. To his surprise, a certain wanted ex Fatui Harbinger had arrived looking exhausted, her head falling down to the bar counter as she drowsily sat. The two had exchanged shenanigans, encountering one another from time to time, and the only reason why Diluc doesn't report her to the knights of favonius is because she saved his life once during a fight with an abyss camp in the woods when they just met. Yet deep within, there was an air of mystery, and distant familiarity about her.

He sighed. "This time, you have to pay, y'know. And I still don't trust you that easily." Diluc grumbled out as he started shaking another drink, arms sturdy and trained.