The Seventh Princess of the Netherworld travels to the Mortal World to undergo a trial of familial bonds, becoming the elder twin sister, Hailey. In her past life, Hailey was adopted by a wealthy businessman but was murdered by her jealous younger sister, Sherry Harper. Unbeknownst to all, the businessman's household was fraught with peril, and Hailey had endured torment there only to protect Sherry. Given a chance to live again, Hailey decides to sever this sisterly bond. Since Sherry desires to be adopted in her place, dreaming of a life as a pampered heiress, Hailey lets her have it. Instead, Hailey chooses an ordinary couple as her parents, building a better and better life for herself, while Sherry, upon finally learning the truth, is left with nothing but regret.
