'Ye-hee', who lost her precious younger siblings, one day becomes possessed as 'Märchen', an ill-fated minor character in the novel <One Greater Happiness>. 'Märchen' is a miserable woman who ends up raising the children of the woman her husband once loved even before the pain of her miscarriage subsides. 'Ye-hee', who is possessed by such a fairy, unexpectedly realizes at once that these children are her deceased younger siblings. Although it is a harsh reality for Marchen, 'Yehee', who carries the memories of her past life, cherishes and loves her children, who are the reincarnations of her younger siblings, and protects her children with her life from beings that target them... As shown in the novel <One Greater Happiness>, the ancient dragon 'Eskaya' who protected the country left behind three treasures in the empire. Under threat from speculation that her children may have one of the treasures, will Yehee be able to protect her children with her husband and discover the secret of their possession in this world?