Shen Dao, a quiet young woman struggling to pay for her younger brother's life-or-death surgery, signs a covert marriage contract that turns her into a replica of Song Ying, the girl who has lain in a coma for five years in Lu Jinheng's heart. After five years of caring for him down to every pill, she slowly loses herself, until news that Song Ying is about to wake brings a trap that drives her out of the house in the middle of a rainy night without a word of regret. By the time he uncovers the truth behind every scheme and the diary recording five years of silent devotion, she has already chosen an exit no one expected.

Minh Khuê is an emergency-room nurse — a quiet young woman who has always lived in the shadow of her identical twin sister. When Minh Hà begs her to step into the role of the Trần Gia conglomerate's lady of the house for "just a few days," Khuê never imagines that the mansion's iron gate will swallow her whole life. In that cold, opulent place, she uncovers a secret that has been buried for five years.