Saeha arrives at the Institution of Radio Research in a world where the Grid was not yet installed. However, his emergence sets humanity on a course towards apocalyptic disaster.
In 1997, a mysterious ghost saved humankind and then disappeared. It reappears again 24 years later and helps a serial hugger escape. Kim Sae Ha, Jung Sae Byeok and Song Eo Jin pursue the ghost for different reasons.