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

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.

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Here’s what she looked like in Season 1:

Park Young-Sol / © Netflix / Courtesy Everett Collection

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

© Netflix / Courtesy Everett Collection

Minyeong Choi plays Dae.

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Gia Kim plays Yuri.

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Here’s what she looked like in Season 1:

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

Park Young-Sol / © Netflix / Courtesy Everett Collection

Sang Heon Lee plays Min Ho.

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Here’s what he looked like in Season 1:

© Netflix / Courtesy Everett Collection

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

© Netflix / Courtesy Everett Collection

Anthony Keyvan plays Q.

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Here’s what he looked like in Season 1:

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

© Netflix / Courtesy Everett Collection

Regan Aliyah plays Julianna.

Here’s what she looked like in Season 1:

© Netflix / Courtesy Everett Collection

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

Peter Thurnwald plays Alex.

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Here’s what he looked like in Season 1:

Park Young-Sol / © Netflix / Courtesy Everett Collection

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

© Netflix / Courtesy Everett Collection

Michael K. Lee plays Professor Lee.

Courtesy of Netflix

Here’s what he looked like in Season 1:

Park Young-Sol / © Netflix / Courtesy Everett Collection

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

Park Young-Sol / © Netflix / Courtesy Everett Collection

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

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

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