Millie Bobby Brown once revealed that her Enola Holmes co-star Henry Cavill established "very strict" boundaries to maintain a professional working relationship on set.

The 22-year-old Stranger Things actress opened up about her dynamic with Cavill, 42, during a 2022 interview with Deadline, explaining how their on-set relationship differed from the "sibling" bond she shares with her Stranger Things co-stars.

"It's different because I grew up with Noah [Schnapp] and Charlie [Heaton]. I met them when I was 10," Brown explained. "So, for me, it does feel like your schoolmates. With Henry, it feels like a real adult relationship. Like a really good friendship, a really healthy one."

Brown elaborated that Cavill established clear parameters for their interaction. "I know Henry. He has terms and conditions with me. I'm not allowed to ask about his personal life. It's like, 'Millie, shut up. No.' And I'm like, 'Understood.'"

She contrasted this with her “Stranger Kids” co-stars, noting, "There's no boundaries because it's like we're all siblings. But with Henry, he's very strict with me, which I appreciate."