When her mother suddenly married a billionaire, Iris found herself bewildered as she became stepsister to the arrogant Charles. Charles, who had always harbored a grudge against his father, mistakenly believed Iris to be evidence of his father's infidelity. Despite his anger, he found himself irresistibly drawn to the warmth of his new family in their cold, luxurious mansion. With their newlywed parents on their honeymoon, Iris and Charles were left to live together, and soon, they started developing unexpected feelings for each other. But as their parents insisted they move to a new city to start a business, even greater challenges awaited...