On the eve of New Year's, a young girl named Erin is tragically separated from her mother, Joan Dale. Eleven years later, Joan has risen to become the CEO of Erinzo Group, successfully acquiring Tusk Steel Factory and earning a reputation as a formidable factory director. Little does she know, one of her employees is her long-lost daughter, who became blind after an accident and was adopted by the Lanes, who named her Thea Lane.