I understand that there are a great variety of monsters that exist. Such was the case in my world, though I can only surmise that there is a 20% probably of it being the same in your world. Regardless...

The only types of monsters that I am aware of that lack a heart are those that may be classified as 'undead'. May I ask what sort of monster you are?

[if she could sound genuinely curious, now would be the time. But she can't, so her monotone (musical?) delivery remains the same as it was when she shot down his joke]