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Tony Stark's intentional evidence

Prove that Tony Stark has a heart. This is evidence of Tony Stark's intention.

Text Interpretation: Pepper (Pepe Potts) teases Tony, suggesting that he has done a lot of immoral things before, and now the prodigal son has returned. Keep this metal heart as a souvenir. (I personally remember that there is an interpretation of this line on the Internet, but I can't find it at the moment. )