of the biggest television show in the world, "Squid Game."

It is streaming now on Netflix.

Here are Lee Jung-jae, Park Hae-soo,

Wi Ha-Joon, and Jung Hoyeon!

[ Cheers and applause ]

Welcome! Yes! Yes!

Welcome, welcome, welcome!

Welcome to "The Tonight Show."

Thank you so much for being here.

-[ Speaking native language ] -Thank you.

-Thank you. -Thank you for having us.

-This is a big deal.

I just want to start.

Jung-jae, you're the first one we meet in the show,

and you're so charming and, like, lovable.

We're rooting for you.

I know that you're famous in Korea

for mostly playing villains in a movie.

How can that face be a villain? You're so friendly and likable.

Can you tell everyone what "Squid Game" is about?

-[ Speaking native language ]

-It's frightening. It is shocking.

But it's also really beautiful,

and right now it is number one on Netflix in 90 countries.

[ Cheers and applause ]

It is bigger than --

Uh, Hae-soo, when did you realize the show became so big?

-Right now.

[ Laughter ]

[ Cheers and applause ]

-Right now? -[ Speaking native language ]

Yeah, right now.

I want to meet Jimmy...

[ Audience awws ]

-That's what I'm talking about. See? This is...

That's my man. I love you. Come on.

Oh. I'm so happy.

Ha-Joon, what do you think

people around the world are connecting to?

-Ohh...

[ Speaking native language ]

-Yeah, it is -- it's bizarre how --

the combo of that.

The children's game, but also people desperate

kind of to just change their life and get money.

And they'll do -- And it starts with the creepiest doll I've --

And I have to show you, for people who haven't seen.

I got this sent over to us.

This came in the mail.

[ Laughter ]

This came in the mail for me. Yeah, thank you so much.

Wait. No. If you haven't seen this...

Wait. Watch this. This is --

So, this is what --

They played Red Light, Green Light,

but this giant doll looks at them, okay?

And she says, "Green light," and her head is turned around.

When she says, "Red light,"

she turns around, and her eyes are cameras.

And if you move, you get shot.

[ Laughs ]

But -- I know.

But, also, this robot is based on a character, right?

From Korean textbooks.

Like, when kids are growing up, you know who this --

Who is this? Who is this psycho robot?

[ Laughter ]

-When we were at the school, there were, like, characters.

One is a boy, and one is the girl.

The boy's name was Chulsoo,

and the girl's name was Younghee.

And she's the one.

-Whew. Yeah.

Jung-jae, this show is pretty dark,

but your character is optimistic and funny.

And I was just wondering, is there anything

that didn't make it to the show that was --

or maybe things that were in the show that were improvised?

-[ Laughs ]

[ Speaking native language ]

-I remember that scene. The --

It's in the first episode. No spoilers.

I'm not giving any spoilers tonight, so everyone knows.

Hae-soo, you became a dad

the day "Squid Game" premiered.

Is that correct?

[ Applause ]

-[ Speaking native language ]

-Baby Squid.

[ Applause ]

-Yeah! Little Baby Squid! How cute! Come on!

I want to show everyone a clip from the show.

This is "Squid Game." Take a look.

-♪ In other words ♪

♪ Darling, kiss me ♪

♪ Fill my heart with song ♪

♪ And let me sing forever more ♪

♪ You are all I long for ♪

♪ All I worship and adore ♪

♪ In other words ♪

♪ Please be true ♪

♪ In other words ♪

[ Music stops ]

-[ Breathing sharply ]

-Ohh!

[ Cheers and applause ]

He saved you! I love it!

The cast of "Squid Game," everybody!

The show is streaming now on Netflix.