In her past life, Isolde's daughter Effie died of acute pneumonia. After killing herself in regret, Isolde is reborn to Effie's birthday party. She immediately exposes her husband Grayson's affair with Belle, divorces him, and leaves him, taking Effie with her. Grayson freezes her cards, thinking she will come back to beg him, yet she has more talent than he thinks. Back as the legendary engineer 'Valkyrie", she becomes an airline's chief engineer under the alias Sophia, and exposes Belle's theft of her design. Effie also defeats Belle's son Kaiden in a maths contest. Grayson is now the one in regret, and she won't forgive him.
