Eight years ago, Song Mirae, a former campus sweetheart, became unable to have children while trying to save her husband Kwon Woojin's life. Not wanting to burden him, Mirae continued their marriage while hiding her identity as the granddaughter of Kiwon Group, the top conglomerate. One day, Woojin proposes adoption to Mirae... For seven years, Mirae lovingly raises their adopted daughter, Jian. However, she faces the unbelievable truth: their marriage was a sham, and Jian was actually born from Woojin and his mistress, Han Chaewon. Mirae gives Woojin multiple chances to change his mind, but he remains convinced that Chaewon saved his life eight years ago and continues to protect her. Meanwhile, Mirae falls victim to Chaewon's schemes to steal her position, leading to a miscarriage of the child she struggled to conceive.