Henry Cavill and Millie Bobby Brown are in a 'adult relationship.'

Henry Cavill and Millie Bobby Brown have a "healthy" and "mature" relationship.

In "Enola Holmes" and the follow-up movie, the two portray brothers and sisters. Millie has spoken openly about her connection with the 39-year-old "Man of Steel" star, stating that despite their 21-year age gap, they share a close relationship.

With Henry, it seems like a true adult connection, like a very wonderful, healthy friendship, the 18-year-old actress told Deadline.com. One is that our terms and conditions are there. Ich kenne Henry. He has requirements for our relationship.

Then Millie revealed that one of Henry's requirements is that she refrain from inquiring about his personal life. I'm not authorised to inquire about his personal life, she continued. In a way, "Millie, be quiet. " No.’ I reply, "Understood."

She continued by stating that her friendship with the other members of the young cast of her Netflix series "Stranger Things" is completely different from her connection with Henry.

With the Stranger Things kids, it's different, according to Millie. It's like we're all siblings, so there are no limits, although Henry is quite rigorous with me, which I like.

"I would say Henry... is a problem solver," she continued of the actor. He is a highly thoughtful person. I'm a bit hysterical. In an effort to find a solution, I'll attempt everything. As opposed to how he always gets everything just precisely...

They share a unique relationship, according to Millie, because Henry doesn't have any sisters in his family. He doesn't have any sisters, she continued. Therefore, it must be entirely different for him. I have a younger brother, a brother, and a sister. I'm therefore accustomed to that type of dynamic." Both off-screen and on-screen, I had to apply a lot of it to my interaction with Henry in order to force him out of his comfort zone."