The Rent Live star is joining the cast as John Ambrose McClaren. Remember the guy from a hidden scene midway through the To All the Boys credits who flipped Lara Jean's world upside down when he showed up at her front door with a bouquet of flowers and the love letter she'd written to him? That's him! We have no idea what this means for Peter and Lara Jean's relationship, but chances are John's return will be a huge plot device in P.S. I Still Love You, and we can't wait to see it all play out.