Elizabeth 'Liza' Koshy is popular, beautiful, and a good girl. David Dobrik is popular with a different crowd and a bad boy. When David makes a deal with a friend it threatens his bad boy persona and Liza's heart.
Liza is you average girl she gets the good grades, she's pretty, and loves social media aka snapchat then the "bad boy" David comes to school messing things up and tries to flirt with her. She wants nothing to do with him.