After reincarnating into a supporting character from a novel she once read, the protagonist assumes the role of Amy, a young landlady with an older sister. Recalling the original plot, she anticipates her sister's tragic fate as the male lead's ill-fated first love. This male protagonist, bearing the scars of a loveless upbringing, grapples with a peculiar curse that transfigures him into a teenager by day. Can this curse be broken, and what twists await in this intricate tale of intertwined destinies?