"Your darkness might become someone else’s light." Oh Dohyeon is a man haunted by tragedy, having lost his wife in a devastating accident. His life is defined by profound loss and lingering grief, leaving him adrift in an unforgiving world.

Min Sia is equally fractured, a woman who chose to isolate herself, crushed under the immense weight of the world's harsh judgments and expectations. She is locked away, seeking refuge from pain, but finding only stagnation and despair.

Fate brings these two broken souls together. They begin to recognize their own pain reflected in the other’s wounds, forcing them to confront the blurry line separating light and darkness. Through their complex connection, Dohyeon finds the capacity for forgiveness, while Sia discovers in him a crucial reason to keep living, a lifeline she desperately needed.

However, the path between guilt and salvation is never simple, and love always demands the cruelest sacrifices. A single mistake froze their lives in time, but as they attempt to walk toward healing and light, their deep connection evolves into "a story of healing deeper than love."