Imma is a lonely girl, trapped in an authoritarian family environment and surrounded by superficial friends who mistake her distress for typical teenage rebellion. Every night, exactly at 4:21 AM, the silence of her room is broken by the blue light of a smartphone: it is the beginning of a dark ritual made of extreme "social challenges" and virtual appointments that demand increasingly dangerous proof.While the adult world remains unaware of the girl's internal struggle, only Erika, a classmate she barely knows, senses the desperate cry for help hidden behind her withdrawn behavior. Through a compelling visual style and immersive sound design, "4:21" explores the boundary between reality and digital influence. It is a race against time that exposes the indifference of society and the quiet power of empathy, bringing to light a truth that few are prepared to face.