Lena devoted her life to her children, but her son John Ward was ashamed of her poverty and claimed she was only a housekeeper to impress a wealthy family. Her long-lost stepdaughter, Grace Grant, had become a billionaire. After saving Lena from suicide, Grace hid her true identity and posed as a CEO's secretary because Lena was seriously ill. When John's fiancée's family repeatedly humiliated Lena at the company, Grace secretly protected her and made them pay for their cruelty time and again.
