Lin Zhixia, ten years gone from this world, finally receives a chance to restart her life—only for it to be put on hold by the deep obsession of her teenage deskmate, Shen Jing'an. As she returns to untie the knots in her heart, she uncovers secrets hidden in time: the unspoken flutter of graduation night, the tender hopes within a silver lock, and a determined search across mountains and seas. On one side lies a smooth, peaceful new beginning; on the other, a deep love that spans the years. Crossing mountains, seas, and time itself, the two set out toward a mutual journey that is ten years late.