Zhou Zuo is seven years older than Jiang Man, and he has been throughout her entire life, from birth to the future.
When he first met his sister, Zhou Zuo had no feelings for her, and gradually he started to hate her a little. But then his grandmother passed away, and Zhou Zuo had no relatives in the world except Jiang Man.
When he met Jiang Man again after the separation, he realized that he was wrong and regretted it. He only wanted to protect her in the future.
Intention: Recognize your own intention