Kelly Fremon Craig Director, Screenwriter Hailee Steinfeld Nadine Actor Haley Lu Richardson Krista Actor Blake Jenner Darian Actor Kyra Sedgwick Mona Actor Woody Harrelson Mr. Bruner Actor Hayden Szeto Erwin Actor Alexander Calvert Nick Mossman Actor Eric Keenleyside Tom Actor Nesta Cooper Shannon Actor Daniel Bacon M.C. Actor Lina Renna Young Nadine Actor Ava Grace Cooper Young Krista Actor Christian Michael Cooper Young Darian Actor Jena Skodje Little Mean Girl Leader Actor James L. Brooks Producer Richard Sakai Producer Julie Ansell Producer Brendan Ferguson Executive Producer Pete Corral Executive Producer Cathy Schulman Executive Producer Zhongjun Wang Executive Producer Zhonglei Wang Executive Producer Jerry Ye Executive Producer Donald Tang Executive Producer Robert Simonds Executive Producer Adam Fogelson Executive Producer Oren Aviv Executive Producer Doug Emmett Cinematographer Tracey Wadmore-Smith Film Editing Atli Örvarsson Original Music William Arnold Production Design John Alvarez Art Director Ide Foyle Set Decoration Carla Hetland Costume Design Melissa Kostenbauder Casting