looking for a manhwa where its like this boy character (black hair red eyes) has regressed...

looking for a manhwa where its like this boy character (black hair red eyes) has regressed or reincarnated i forgot and mc (girl) gets reincarnated into that story and does her best to be apart of the dude’s party and also she fakes her personality to be the sunny heroine type or something

im pretty sure his ability is like “commander” or something and mc uses a gun i think

i also remember something about him thinking ahe likes headpats but she really doesnt