This live-action adaptation of the popular PC game "Marriage Blue" centers on the marriage between an ordinary salaryman and his beautiful, kind, and gentle girlfriend of six years since college. As they prepare for their wedding, an unexpected figure appears—an old university circle acquaintance, once known as the flashy, womanizing senior. Now working as their wedding planner, his presence triggers unforeseen developments. His arrival becomes a crucial turning point, dramatically altering the couple's marriage and driving the story toward its intense climax.