Jang-soo is a judo instructor who is indifferent to everyone but his daughter. One day he realizes he can see Tae-jin, a ghost who used to be a devoted police officer. Tae-jin asks Jang-soo to help solve the case that took his life away from him.
One day, Hye-sook is tricked by her mother into visiting her hometown. When she finds out that her mother is fine and tries to leave for Seoul, she hears about the passing of Taek-gyu's father. After the funeral, Hye-sook plans to return to the city. Gi-ju, a struggling writer, tries to drown himself at Andong lake but Taek-gyu saves him. Hye-sook used to draw for Gi-ju's writings when they were young. The two were each other's first love and through the reunion, they are about to rekindle their old romance.
Popular TV anchorwoman & late night DJ Ko Sun-Young set to host her final radio program. During the show, she receives a startling text message instructing her to follow specific directions or endanger the lives of her family.
Mute Hee-Jin is working as a clerk in a fishing resort in the Korean wilderness; selling baits, food and occasionally her body to the fishing tourists. One day she falls in love with Hyun-Shik, who is on the run from the police, and rescues him with a fish hook when he tries to commit suicide.
North Korea's 8th Special Forces hijack a shipment of CTX, a potent new liquid explosive, and threatens South Korea as part of a plot to re-unify the two countries. Ryu and Lee, special agents of O.P., South Korea's secret intelligence service, attempt to track down the terrorists and find the CTX. Meanwhile Hee, the 8th's ultra-bad female sniper, resurfaces to wreak havoc and haunt Ryu.
