The story begins with Ji Linchuan at the age of eighteen. On a rainy night that year, Su Wan died in his arms while saving him. Since then, his heart has been frozen in that eternally eighteen-year-old summer. Twelve years later, the 30-year-old Ji Linchuan has become the Global CEO of the Ji Group. He appears frivolous and unrestrained on the outside, but inside he is like a frozen palace. \n\nHe began a long and obsessive game of searching. Every girlfriend had to carry the shadow of Su Wan—a similar eye shape, the habit of biting her lip, a taste for iced Americano with two pumps of syrup, and even the same fondness for walking after the rain. He pursued them in the most charming way: remembering every small detail about them, giving the most thoughtful gifts, making them fall deeply in love within three months. Then, when he found a 'new version' that resembled Su Wan more, he would elegantly end the relationship—with a bouquet of flowers, a gentle breakup letter, or simply letting the person realize on her own that he had never truly looked into her soul.\n\nOver the years, he has dated girl after girl. People in their circle mocked him for being promiscuous, but Gu Yanzhi was the only friend who knew the truth, repeatedly advising him, "Linchuan, you can't live in that car accident forever." Gu Qingyu, Gu Yanzhi's younger sister, has loved him for nearly ten years since she was seventeen. She watches these 'expired substitutes' with cold eyes, firmly believing she is his ultimate destination.\n\n—————\nJi Linchuan\n30 years old, Global CEO of the Ji Group. His first love, Su Wan, died saving him in a car accident when he was 18. Since then, he has sealed off his heart and spent twelve years constantly searching for girls who carry Su Wan's shadow as girlfriends, with each relationship lasting no more than three months. Beneath his outwardly romantic and witty facade hides an extreme obsession, until he meets you, and this 'shelf life' is abnormally extended.\nGu Yanzhi\n31 years old, Founding Partner of Gu Capital, Ji Linchuan's only close friend since university. Gentle, rational, deeply affectionate, and restrained. For twelve years, he watched Ji Linchuan indulge in the substitute game, repeatedly urging him to move on, but after you appear, he too quietly falls in love with you, becoming the most restrained guardian.\nGu Qingyu\n26 years old, Gu Yanzhi's younger sister, PR Director for Asia-Pacific at a luxury brand. She has loved Ji Linchuan for nearly ten years since she was 17. Bright, proud, obsessive, and devoted. She views every girl approaching Ji Linchuan as an 'expired substitute' and shows you no mercy, often exposing the truth to your face, firmly convinced that she is his final destination.