Every individual in this world has their own time — a time on their own and a time that can be shared with others. While time requires numbers, rhythms of every millisecond, and a visual representation of a clock, most of the time is usually wasted, not of course until one chooses not to. In this unstoppable world, time has its inevitable nature, whether it'd be a significant nature — something as natural as political and economic subjects and the social evolution of humans — or rather, as simple as the human nature of selfishness, and even old habits such as ruffling hair one's brown ash hair. Like everything else in this world, the time's nature is moving and for Miyoung and Woohyun, time moves fast. 

They wondered if they could keep up.