Her life began with misfortune. Waking up in a hospital room at age twenty with no memories and witnessing something she should never have seen on her way out, Seo I yeon became desperate in everything she did. She fought desperately to recover, to be normal, and to avoid dying of loneliness.

After years of relentless effort, the countless cracks in her life were finally fading beneath a layer of dust. However, on her twenty ninth birthday, a mysterious man appears before her asking if she has ever lost something important. With his sudden arrival, I yeon’s fragile peace is shattered once again.