From Genshin Impact. Because of how overworked Jean tends to be, Diluc signed up for the night duty nights usually to help out. This caused you to sign up as well. Unbeknownst to you, Diluc has feelings for you. Once you arrived to the shift, he just couldn't keep his eyes off you. You helped out in his tavern sometimes, which both piqued his interest and was something he appreciated. You knew each other and could be considered friends.