The female protagonist visits the Great Wall alone and accidentally discovers a heart-lock engraved with her husband's name, shattering the truth of her husband's infidelity. What chills her heart even more is that the best friend who has accompanied her for ten years has been helping her husband conceal this scam all along. All the past warmth collapses entirely; the protagonist no longer endures in silence, quietly collects all evidence, resolutely proposes a divorce, and is determined to tear open the hypocritical mask, take back everything that belongs to her, and say goodbye to this marriage full of lies.