Čejen Černić was born in Osijek, Croatia. She holds a degree in Film and TV Directing from the Academy of Dramatic Art in Zagreb. Čejen has directed several short films, including the short fiction Followers, and short documentaries The Circle, To Me Without Me and Il Postino. Since 2007 she has worked as an assistant director on feature films and serials, documentary and animated films and a dance show associate. In 2013 she wrote and directed her first short animation The Girl Who Loved Fairy Tales and in 2017 she directed her first feature narrative The Mystery of Green Hill from the popular Koko serial, which earned her the best debut award at the 64th Pula Film Festival.