Theatre has two interesting possibilities.
On a recovery path, acting could help the MC get in tune with their emotions and understanding people.
On a non recover path, the MC is just honing their infiltration skills.
“You use smile number three, vaguely friendly greeting, after deciding that smile number five, I will enjoy hurting you now, or smile ten, I find you attractive and would like to initiate romantic relations, were not appropriate for the current situation. As you bare your teeth in the right way to fake the emotion, you extend your hand to shake a hand.”
Oops, I see it doesn’t matter anymore, never mind then.