The setting sun was like blood, and the rusty city gate slowly opened with the sound of gears grinding. Su Wanzhao stood in front of the desolate Old New Year City after the war, clutching the gear engraved with traces of time in her palms - this was the token of her young agreement with Gu Zhaonian, and it was also her only thought in the fire that devoured everything.
After five years of wandering, she returned with a "photographic memory" tempered by the fire, but she encountered the cruelest reality at the gate of the city: the young man who had promised to tide over the difficulties together had become the male owner of Lin's nursing home, and beside her stood the smiling Lin Zhixia. The door of Gu's house that was once opened to her now has a plaque belonging to someone else.
When the "dead" Bai Yueguang reunites with his frustrated old love, guilt and temptation spread among the ruins. With the power of photographic memory, she found suspicious points of fire in the rusty pendulum patterns, identified chronic poisons in the traces of drug dregs, and pieced together the truth from the subtle flaws in the witnesses' words - it turned out that the fire that displaced her was actually a conspiracy carefully planned by her "savior" Lin Zhixia.
Lin Zhixia's difficulties followed one after another. Forged evidence and vicious slander forced her into a desperate situation. But Su Wanzhao never flinched. She used her precise memory to fight back against the trap, and used the gear marks to point out the seriousness, making all the lies invisible to the traces left by time.
Betrayal in the fire, reunited five years later, in this scarred and deserted city, can they clear away the fog and repair the agreement that was burned by the fire? When the truth bites together like gears, will their new warm sun rise from the ruins of the old city?
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