Warning: Spoilers ahead for "Stranger Things" season two.

The season finale of "Stranger Things 2" ended on a heartfelt note with Eleven and Mike reunited at the Snow Ball. But an almost sweeter moment came minutes earlier when it was revealed that Jim Hopper had acquired official documents naming Eleven (now Jane Hopper) as his daughter.

But how will these relationships play out in the coming seasons? INSIDER spoke with David Harbour about the new father-daughter dynamic between Hopper and Eleven.

"One of the fun things moving forward in terms of this new family we have with Hopper and Eleven — and the fact that she's becoming a teenager and a young woman — is I think that is going to be infinitely complex and f----- up for Hopper," Harbour said. "I don't think he knows how to handle this at all."

Hopper has known that Mike and Eleven have a burgeoning preteen romance, and even seemed to conveniently choose to interrupt what was about to be their first kiss of season two.

Eleven said goodbye to Mike quickly after reuniting with him, because she had to go to Hawkins Lab with Hopper. Netflix

"[Laughing] People were so mad about that!" Harbour said. "Whatever. It was the wrong time, all right? There's a time and place. We gotta go to the lab and kill some Demodogs godd-----, and close the gate. There's no time for kissing! I can't believe that people were mad at me over that."

Harbour said his character is clearly trying to be supportive, though, given how he approached the Snow Ball at the end of season two.

"But look, I brought her to the dance and I was well aware of what would happen," Harbour said. "And I let her go in by herself and I waited outside with Joyce, all right?"

Eleven and Mike dancing at the Snow Ball. Netflix

Hopper even gave Eleven his special bracelet (which used to be his daughter Sara's hair tie) to wear to the Snow Ball.

But Harbour says he can definitely envision a future scene where Hopper needs to have the "dad talk" with Mike about dating his newly adopted daughter as the kids enter high school.

"The fun thing about the dad aspect of Hopper is going to be how he handles a teenage daughter and her relationship to a boy like Mike," Harbour said. "So there may be that conversation where he has to sit Mike down on the couch when he comes calling for the date and she's getting ready, and Hopper will be like 'Sit on the couch — what are your intentions with my daughter?'"

Hopper and Eleven shared a honest and heartfelt conversation in the car during the finale. Netflix

"That scene may be coming in season three," Harbour said. "I would relish that, because the amount of difficulty it'd take for Hopper to do that is going to be pretty hysterical."

We'll have to wait for "Stranger Things" season three to see exactly how this dynamic will play out, but as Harbour assures fans, it's guaranteed to be interesting.

For more on "Stranger Things," read our breakdown of 13 callbacks and references you might have missed on season two.

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