For a thousand years, Kim Taehyung has been watching humans as they evolve. He has been adapting very well from generation to generation. On the day when the whole nation mourned for the king, when he was sent to war... he was never gets excited. Life was too boring to the point where he dreamed about death. However this year, on the 20th century, Jung Soojung gave him a chance to feel how life actually works.

After 3 years we spent each day together, finally you left me. I have tried to forget you, but the more I tried to escape, the more my days are controlled by you.    

"Team, we got a new case." Suzy said. Made every eyes on her. "Byun Baekhyun, Kwanlim high schooler, found unconscious at the school backyard. We found his wallet at the 4th level near the stairs lead to 3rd level. Looks like he fell from there. He suffered severe bleeding in his head, and died on the way to the hospital." She explained before she show a photo of a high schooler boy. "Isn't it obvious? It's suicide." Sohee said. "Looks like it. But we found another student." S