Lu Mingyue, adopted by the Lu family, once had three loving older brothers and a happy life. But everything changed when the Lu family's biological daughter, Lu Xingchen, returned home. Mingyue was reduced to a 'stand-in', and was bullied and ignored. After repeated misunderstandings and injuries, Mingyue grew disheartened and volunteered for her older brother's scientific project, the 'Mingyue Sleep Plan', agreeing to sleep for thirty years to repay the family's kindness. She also donated her cornea to help restore her second brother's vision. When she disappeared, the Lu family finally realized the truth and regretted their actions. Thirty years later, the experiment succeeds, but when Mingyue wakes up, she has forgotten everything...