Xue Ji is an immortal girl. Rescued by alien powers, she has been traversing the earth for centuries. Desensitized, frosty and indifferent in the inside, despite the bright smiles that play on her lips, she only lives with the goal of finding her first love from a thousand years ago… Finally she meets Gu Shi Yi, a man carrying her love’s face, but his love is different than that of the former, rekindling her passion and enthusiasm for life, and perhaps unraveling the knot from many centuries ago.

The story of four ordinary boys who are born to find a way to open a doorway through time. With this ability, they can see into the future and discover how to solve problems and how the future will unfold. They come together and choose to take on the roles of Time Heroes, where they will solve problems for people and change the future for those who ask— these events range from family affairs all the way to national incidents. Problems and chaos begins to grow as certain futures are not fixed, or even unable to be seen.