Yuan Xin, a college girl (around 22 years old), has no one to rely on due to changes in her childhood family. Due to her debt and longing for her deceased mother, she raised her half-brother Tang Guan with locked-in syndrome on her own, fearlessly and without fuss.
Tang Guan's disease worsened, and the cost of treatment became unaffordable for Yuan Xin. Her life was changed beyond recognition because of the shame she carried. During a part-time singing residency, she accidentally met Chen Xiao, who was twenty years older than her. Not only did the latter pay her expensive medical bills for no reason, but he also gradually became embedded in her life. Chen Xiao didn't say he loved her, but he refused to give up controlling her life. Everything about him is a mystery to Yuan Xin, but for Tang Guan Yuan Xin is willing to take any risk, and even agrees to his proposal when she falls. Their emotions include half the world, the feasting of the upper class, wars, and a series of social events... At that time, she has grown from a female student with nothing to Chen Xiao's indestructible lover. And her lover is still a mystery to her. Their birth and secret love are brewing with harm and crisis, which secretly makes Yuanxin embark on the road of becoming "Yuanshin"...