Four years. What may seem like such a simple number to others is, to Ye Chuxia, the deepest scar on her heart. Four years have passed, and although the pain is no longer as heartbreaking as before, she knows that it has always existed, and has always been there, aching faintly. She could not forget the man named Xiang Munan, so she chose to give up everything and return to China, only to meet a man with the same face as Xiang Munan - Xiang Mubei. What kind of connection will happen between them? Are there really people who look exactly the same in this world?