Now we know for sure.

It all started because Robert Kelly forgot to lock the door.

The Korea expert/dad was besieged by his small, adorable children during a live interview with the BBC last week. After days of silence, he's told The Wall Street Journal what he really thought about the whole thing.

"It was terribly cute," he said. Echoing the words of basically every human being with a heart and internet access.

"I saw the video like everybody else. My wife did a great job cleaning up a really unanticipated situation as best she possibly could…It was funny. If you watch the tape I was sort of struggling to keep my own laughs down. They’re little kids and that’s how things are."

So what happened? When the interview began, Kelly's wife, Kim Jung-A, and his two children, four-year-old Marion and eight-month-old James, were watching him on the TV in the lounge room.

Mom was filming it on her phone so Kelly would have a record of it, and little Marion saw her dad on TV, and recognized the location.

She went to find him. Her brother trailed behind her.

Because of the time delay, Kim didn't realize what had happened until she saw her daughter—bright and clear—on the TV.

She then dashed into the study in her socks to retrieve the kids.

"He usually locks the door. Most of the time they come back to me after they find the locked door," she explained." But they didn't. And then I saw the door was open. It was chaos for me."

Is there anything a daughter can do to make her dad mad? I'm sure probably a lot (sorry, Dad) but when you're small, cute, wearing yellow, and the star of this week's viral video sensation at the expense of your parents, it turns out the answer is no.

"This is my life," Kelly says, somewhat ruefully, at the end of the interview.

In their first interview since that infamous Skype mishap, Robert Kelly and his wife Kim Jung-A on global reaction https://t.co/pM6vGBmGoL pic.twitter.com/0nxY2SBDWK

— Wall Street Journal (@WSJ)

Sure is. And little Marion's now infamous strut, which her dad says was due to the "hippity-hoppity" mood she was in after a class party, has so enraptured the world that the family is planning a press conference for the Korean media on Wednesday.

"I made this minor mistake that turned my family into YouTube stars. It’s pretty ridiculous," Kelly said.

We're glad he did.