Season 2 of XO, Kitty is finally streaming, which means school is officially back in session for KISS!

The cast of "XO, Kitty" takes a selfie in Season 2.

And to celebrate the return of the Netflix series, let’s take a walk down memory and see how your favorite characters have changed since Season 1:

To start, Anna Cathcart plays Kitty Song Covey.

Anna Cathcart on the red carpet.

Amy Sussman / Getty Images

Here’s what she looked like in Season 1:

Anna Cathcart in Season 1 of "XO, Kitty."

Park Young-Sol / © Netflix / Courtesy Everett Collection

And here’s what she looks like in Season 2:

Anna Cathcart in Season 2 of "XO, Kitty."

© Netflix / Courtesy Everett Collection

Minyeong Choi plays Dae.

Minyeong Choi on the red carpet.

Amy Sussman / Getty Images

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Gia Kim plays Yuri.

Gia Kim on the red carpet.

Michael Buckner / Variety via Getty Images

Here’s what she looked like in Season 1:

Anna Cathcart, Gia Kim, and Minyeong Choi in Season 1 of "XO, Kitty."

And here’s what she looks like in Season 2:

Gia Kim in Season 2 of "XO, Kitty."

Park Young-Sol / © Netflix / Courtesy Everett Collection

Sang Heon Lee plays Min Ho.

Sang Heon Lee on the red carpet.

Shane Anthony Sinclair / Getty Images for HM

Here’s what he looked like in Season 1:

Sang Heon Lee in Season 1 of "XO, Kitty."

© Netflix / Courtesy Everett Collection

And here’s what he looks like in Season 2:

Minyeong Choi and Sang Heon Lee in Season 2 of "XO, Kitty."

© Netflix / Courtesy Everett Collection

Anthony Keyvan plays Q.

Anthony Keyvan on the red carpet.

Michael Buckner / Variety via Getty Images

Here’s what he looked like in Season 1:

Anna Cathcart and Anthony Keyvan in Season 1 of "XO, Kitty."

And here’s what he looks like in Season 2:

Anthony Keyvan and Anna Cathcart in Season 2 of "XO, Kitty."

© Netflix / Courtesy Everett Collection

Regan Aliyah plays Julianna.

Regan Aliyah standing by a pool.

Here’s what she looked like in Season 1:

Regan Aliyah in Season 1 of "XO, Kitty."

© Netflix / Courtesy Everett Collection

And here’s what she looks like in Season 2:

Gia Kim and Regan Aliyah in Season 2 of "XO, Kitty."

Peter Thurnwald plays Alex.

Peter Thurnwald on the red carpet.

Steve Granitz / FilmMagic

Here’s what he looked like in Season 1:

Peter Thurnwald in Season 1 of "XO, Kitty."

Park Young-Sol / © Netflix / Courtesy Everett Collection

And here’s what he looks like in Season 2:

Peter Thurnwald in Season 2 of "XO, Kitty."

© Netflix / Courtesy Everett Collection

Michael K. Lee plays Professor Lee.

Michael K. Lee in Season 1 of "XO, Kitty."

Courtesy of Netflix

Here’s what he looked like in Season 1:

Michael K. Lee in Season 1 of "XO, Kitty."

Park Young-Sol / © Netflix / Courtesy Everett Collection

And here’s what he looks like in Season 2:

Michael K. Lee in Season 2 of "XO, Kitty."

Park Young-Sol / © Netflix / Courtesy Everett Collection

Finally, Noah Centineo makes a special guest appearance as the beloved Peter Kavinsky.

Noah Centineo sitting on a couch.

Alexander Tamargo / Getty Images

Here’s what he looked like in 2018’s To All the Boys I’ve Loved Before:

Lana Condor, Anna Cathcart, and Noah Centineo in "To All the Boys I've Loved Before."

And here’s what he looks like during his cameo in Season 2, Episode 6:

Noah Centineo in Season 2 of "XO, Kitty."