"I Only Live Once" is a behind-the-scenes documentary of the movie "YOLO" which truthfully chronicles director Jia Ling's unknown behind-the-scenes stories while filming "YOLO" The documentary took 20 months to shoot and produce, divided into 4 episodes: "Adventure," "Transformation," "Sprint," and "Boxer." It serves not only as a documentary of the behind-the-scenes work of the movie but also as a full account of Jia Ling's adventurous and tumultuous journey to shape her character.