Nineteen-year-old Su Wanning knew that she was not the daughter of the Lu family, but she still lived in the 25-year-old Lu Chen's family as a "sister"; she first premeditatedly occupied his space, time and emotions, but in the end she had to give up control and have her own career and life. Lu Chen, who had always mistook love for responsibility, had to take the initiative to choose her to become his equal lover and family member after losing the excuse of "brother".
