Help me find this manhwa

I really dont remember the name but I do remember a picture of the uke with red hair shooting a gun in a shooting range so i think it MIGHT be action genre-ish? The seme i believe also had black hair and was standing behind him watching in the panel. I remember a seperate piece of art with them dressed in historical korean clothing but im not sure if that was apart of the manhwa itself or special art from the creator