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Lin Weiwei got married for her sister and became the cheapest substitute in Gu Hanshen's eyes. She lived in her sister's shadow, imitating her preferences, enduring his indifference and humiliation, and even love became a luxury. She was the star promised in his childhood, the white moonlight engraved in his heart, but he didn't know it and gave all his tenderness to the imposter sister. He protected her with his life in the fire, but when he woke up, he completely forgot about her, leaving her alone to guard the broken memories. It turned out that the most painful thing was not being a substitute, but that he had loved her all his life, but never knew that the person he loved had always been her.

-The heroine: Wen Jinchu, majoring in law, rational, gentle, and observant. In high school, she secretly hid her secret love in her heart. She is calm and has a bottom line in situations. - Male protagonist: Lu Jingsheng, a police academy student who later developed his career as a plainclothes criminal investigator. He has a cool and restrained appearance and is nimble in his skills. He has secretly liked Wen Jinchu since high school. Due to his special profession and past secrets, he is used to hiding his emotions and whereabouts.