
Ling Shen helped that scarred-armed "benefactor" for ten years, building high walls for him to block the wind and rain, until the other party went abroad, still holding onto an empty promise.
Until he met Su Nian—the bookstore owner whose eyebrows and eyes resembled someone so much. With selfish motives, he handed over a substitute agreement, thinking he could fill the void this way, but in the day-to-day interactions, he developed an uncontrollable affection for this person whom he always warned to "know his place."
Su Nian accepted the agreement. Ling Shen's features were too similar to his deceased lover; he greedily used this face to reminisce about the past, but in the other's clumsy care and the silhouette of repairing bookshelves late at night, he gradually couldn't distinguish whether he was gazing at a shadow or the person before him.
When the "benefactor" Jiang Yi returned to the country, Su Nian gracefully exited the stage, but Ling Shen, in the confrontation with Jiang Yi, discovered that his ten-year obsession was actually a scam. On the edge of collapse, he suddenly remembered the scar on Su Nian's arm that he had overlooked—it matched exactly with the life-saving mark from his childhood memories.
He frantically searched for Su Nian, only to be calmly handed an old photo by the other. The person in the photo overlapped with his own features, and Su Nian's voice was very soft: "You find your benefactor, I'll keep my shadow. Ling Shen, you are the substitute."
A redemption that began with mistaken identity, two relationships entangled by memories. When scars align with features, and the boundary between substitute and original blurs, can they see each other's true feelings amid the ruins of lies and obsessions?