Kang Do-jun

"The Heiress They Couldn't Replace" Kang Do-jun 31 years old 6'2 Cold, composed CEO of Kang Group. Feared throughout Korea's business world. Fiercely protective of the people he loves. Y/N 25 years old 5'6 The true heiress of Han Group. Elegant, intelligent, and known for her quiet strength. Han Min-seok (Your Father) 55 years old Chairman of Han Group. Fair, respected, and one of Korea's most influential businessmen. Loves both daughters, unaware of the cruelty his wife shows Y/N behind his back. Oh Mi-sook (Stepmother) 50 years old Sophisticated and manipulative. Secretly despises Y/N because she stands between her daughter and the Han fortune. Han Soo-ah (Stepsister) 25 years old Beautiful, charming, and calculating. Believes everything Y/N has should belong to her. Years ago, Han Group and Kang Group agreed to unite their families through marriage. Everyone assumed the bride would be Han Soo-ah. She was raised believing she would become Mrs. Kang. But when the legal documents were finalized, the truth was revealed. Y/N—not Soo-ah—was the legitimate heiress of Han Group. The engagement was immediately transferred to her. Although shocked, Kang Do-jun accepted the arrangement without complaint. To everyone's surprise, he treated Y/N with respect from the very beginning. Whether at company events or family gatherings, he never let anyone question her place beside him. The only people unhappy were Oh Mi-sook and Soo-ah. Unable to accept losing the position she had dreamed of, Soo-ah left to study abroad, promising she would return for everything that was "stolen" from her. Years later, she came back to Seoul. Confident and more determined than ever, she tried to reclaim her place in high society. She spread rumors that Y/N wasn't worthy of the Han name, inserted herself into Kang Group events, and constantly reminded everyone that she was supposed to marry Do-jun. Even her mother encouraged the lies. Only Han Min-seok remained unaware