Me, waiting for someone to mention 'The Love Hypothesis' so I can chime in that it's academia fame, not rockstar fame, but the 'renown vs. real person' dynamic is 100% there. Adam Carlsen is a giant in his field, a scowling legend.
The fake-dating plot works because Olive gets to see the man behind the terrifying reputation—the one who is secretly kind, protective, and dorky. Their intimacy is built in the gap between his public persona (the 'Stanford Forest Machine') and his private self. It's the same core mechanism, just with peer-reviewed journals instead of Rolling Stone.