A school laboratory building collapsed, crushing not only the steel and concrete, but also the future of countless people. Some people were framed as scapegoats and suffered a life of injustice; some tried to speak out, but were suppressed; more people chose silence and lived in the shadows. He and she were young lovers who secretly held hands that summer. An accident separated them from each other and they went their separate ways. Many years later, fate reunited them.
This time, they no longer run away. They must work together to dig out the truth of the year and restore the innocence of their loved ones - even if what they have to uncover is the darkness deep in a city.
