In order to save her seriously ill mother, Su Wan signed a contract and became Gu Yeshen's "hidden bride". He needs her just because she has a face that resembles that of an old friend. A contract, a transaction, she was his carefully crafted substitute and the canary in his cage. In front of others, she was glamorous and affectionate with him; behind the scenes, she had to imitate other people's shadows even when she breathed, enduring his indifference and paranoia.
He warned her: "Remember your identity, you are just a substitute, don't cross the line." She abided by her duty, playing the role of a soulless puppet. When crises came one after another, the substitute's mask shattered, and the truth was gradually revealed...
Gu Yechen suddenly realized that what he had long been obsessed with was not the obsession with yesterday's old image, but the real and vivid her in front of him. However, when he finally wanted to hold her in his arms, she decided to leave. "The contract has expired, Mr. Gu, we are settled."
The cage he built with his own hands ultimately trapped his own heart.
