For a teen, the discovery of an app on her phone that enacts revenge on anyone whose name she writes could mean the end of her days as a pushover. Kim Hyang-gi, Kim Hwan-hee, Cha Eun-woo, Lomon, Ji Geon-woo, Park Mi-sun, Lee Doo-Il, Park Kyeong-rim, Ham Seong-min, Jo A-young, Lee Jini, Tae In-ho, Hwang Tae-gwang, Kim San-ho, ASTRO Added on Amazon Prime 2020-12-30. Youtube Trailer