The male protagonist Jiang Yi and the female protagonist Su Nian are legally step-siblings because their parents remarried, and they are not related by blood. Jiang Yi was five years older than Su Nian. Su Nian was 13 and Jiang Yi was 18 when they remarried. They lived under the same roof for five years, but their secret love was restrained because of their status as "brother and sister". The story revolves around the journey of two people from repressing their heartbeat to breaking through the constraints and running in both directions. It focuses on delicate interaction, extreme preference and gentle protection.
