He even told her at one point that he got his teeth fixed after meeting her because he wanted to feel attractive enough for her!

Source: https://www.buzzfeed.com/tatianatenreyrowhitlock/dudley-dursley-harry-melling-in-the-queens-gambit

News – Yes, That’s Dudley Dursley In “The Queen’s Gambit” And I Have A Crush On Him Now