Orphaned Namgung Byeol was adopted into the Namgung family and once lived a happy life showered with love by her three older brothers. However, everything changed when Namgung Dal, the biological daughter of the Namgung family, returned home. Repeatedly facing misunderstandings and hurt, a discouraged Namgung Byeol volunteered for her eldest brother's science experiment, the 'Star Sleep Project,' agreeing to sleep for 30 years to repay the family's kindness. She also donated her corneas so her second brother could regain his sight. The Namgung family, realizing the truth and regretting their actions after her disappearance, waited for her. Thirty years later, the experiment was a success, but upon waking, Namgung Byeol had forgotten everything...