Smiling to a sadder me gave a quite strong effect.
Try to compare it when you see a happy guy smiling to a grumpy person on the street. You’ll probably think positive about the smiling guy as he does something good for the grumpy person. You wish the grumpy man will also smile, and you could even disapprove when the person keeps being grumpy. Important is that the opinions you have about the two people
When you recognise that it’s the same person, you get an internal conflict as you think both good and bad about the same person.