Dasein is a philosophical short film that interprets Heidegger’s concepts of 'authenticity', 'thrownness', and 'the nothing' through metaphorical storytelling. It unfolds in three distinct forms: an adaptation of The Death of Ivan Ilyich, illustrating the tragedy of an inauthentic life; a documentary scene of the filmmaker performing a VO2 max test, symbolizing the pursuit of self-improvement and purposeful action; and a hybrid animation of a mayfly's short existence dying in a graveyard, reflecting on mortality and existential awareness. The film invites viewers to confront the human condition and question the nature of authentic existence.