To not burden their impoverished parents, two siblings decide to share a pair of shoes after the brother loses the sister's. While this turns out to be more difficult than they imagined but fate offers a chance in the form of a marathon.
“我不介意你心里有他”——周沉在沈颐乔最无助之时对她伸出援手，两人闪婚之后一直过着安稳幸福的生活，直到沈颐乔前男友回国，一切平静的表象都被打破。面对老婆前男友光明正大撬墙角的行为，克己复礼的周沉终于展示了自己偏执占有的一面。
