He who once was ｜ Promise of an Ideal lover Vanishes, Leaving a Heartbreaking Mystery

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[Synopsis] 

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Weiwei and Xiang met during their university days, and they shared many wonderful moments together. For Weiwei , having Xiang's companionship made her feel secure. Xiang may have promised to love only her for a lifetime. When they both completed their university studies and found stable jobs, Xiang proposed to Vivi, and they eagerly planned their future together. However, an unexpected event shattered their current happy life. Faced with this test of life, what choices will the two lovers make?