Genius scientist Sejeong lives with her cyborg husband Sungmin. She erased Sungmin’s memories and inputted new customized memories and information of her choosing, so she is able to enjoy a blissful marriage. Then someone Sejeong and Sungmin knew before he became a cyborg starts coming to their home. This person tries to correct Sungmin’s distorted memories while Sejeong tries to stop her. Sungmin, in the meantime, starts lying like a human being. What happened before Sungmin was turned into a cyborg?

Yu-jin is very excited at the news of her sister's returning home. Her sister, Seung-jin, is supposed to come with her husband, Jin-ho. However, Jin-ho tells Yu-jin that Seung-jin committed suicide. Jin-ho seduces the upset Yu-jin, and Yu-jin's husband suspects that Yu-jin and Jin-ho have an affair. But Yu-jin cannot believe that her sister is dead. Yu-jin meets a man who has the same email ID ad her sister.

Two North Korean soldiers are killed in the border area between North and South Korea, prompting an investigation by a neutral body. The sergeant is the shooter, but the lead investigator, a Swiss-Korean woman, receives differing accounts from the two sides.

In Seoul, a suicidal student meets a young woman who decides to join him in his fatal gesture. Dongsoo, an unsuccessful filmmaker, spots a beautiful young woman, who happens to be the lead actress in the film he has just seen. Their stories will cross paths thanks to their love for cinema.

Ji-su is finally released from jail and reunites with his stepsister Ji-hyeon. However his father had dark secret that neither of them knew before; both Ji-su and Ji-hyeon are half-siblings.

Ahreum sits in a small café, typing on her laptop. Around her, customers enact various dramas from their lives. Is she writing what she hears or is she hearing what's been written?

During the reign of King Sejong in the 15th century, the Joseon Dynasty was the embodiment of the perfect state. To the Ming China, the aspiring imperial power, Joseon presented an obstacle to territorial expansion. To protect themselves from war, King Sejong develops a secret weapon to defend their territory and take back their land and supremacy.