The Treadstone project, having created super spy Jason Bourne, turns its attention on a new protocol to develop unstoppable superhuman assassins.

Woo-Jin changes into a different person when he wakes up. He falls in love with Yi-Soo.

During the confusing and conspiratorial Joseon Dynasty King Gwang-hae orders his councilor, HEO Kyun, to find him a double in order to avoid the constant threat of assassination. HEO Kyun finds Ha-sun, a jester who looks remarkably like the king, and just as feared, Gwang-hae is poisoned. HEO Kyun proposes Ha-sun fill the role as the king until Gwang-hae recovers fully and grooms Ha-sun to look and act every bit the king. While assuming the role of the king at his first official appearance, Ha-sun begins to ponder the intricacies of the problems debated in his court. Being fundamentally more humanitarian than Gwang-hae, Ha-sun’s affection and appreciation of even the most minor servants slowly changes morale in the castle for the better. However, his chief opposition, PARK, notices the sudden shift in the king’s behavior and starts to ask questions.

Cheol-Min, a man with a dark, picks up a part-time night job as a parking lot attendant. He sits in the tiny pay booth in the parking lot and stares at the small television. A woman named Jung-Hwa walks into the booth. Cheol-Min realizes the woman is blind and she is confusing him for the parking attendant who worked there previously. Nevertheless, the woman comes back on another night to watch the same television drama series. Cheol-Min starts becoming attached to Jung-Hwa and they find out they are connected by the same incident in the past.

HA Yoon-ju becomes the newest member to a unit within the Korean Police Forces Special Crime Department that specializes in surveillance activities on high profile criminals. She teams up with HWANG Sang-Jun, the veteran leader of the unit, and tries to track down James who is the cold-hearted leader of an armed criminal organization.

Two best friends, So-yool and Yeon-hee, dream of becoming the top artists in Seoul together. But their friendship doesn’t last long as Yoon-woo, So-yool’s first love and songwriter, falls in love with Yeon-hee and her voice. So-yool’s feeling of jealousy and inferiority towards Yeon-hee grows by the day, and she eventually makes a drastic decision to bring the two lovers down.

A newly elected prime minister is assassinated as part of a conspiracy, and a deliveryman has to flee for his life when he is framed and the evidence against him begins to accumulate.

Set in the future, South and North Korea agree to set up a unified government. They have prepared for the unification for the past 7 years. Meanwhile, demonstrators, supporting and opposing the unification, become more fierce. A group against the unification commit terrorist acts. A special police force is formed in response.

Dr. Mi-Soo misdiagnoses a patient after she meets the woman’s husband, whom she assumes to be abusive. With his wife in grave condition, the man sues the hospital. Kang-Il is a widowed firefighter who overhears the situation and when he attempts to counsel the woman’s husband, he is assaulted by him. When Mi-Soo learns about the confrontation, she tries to get Kang-Il to be a character witness for her and realizes that he may also be her true love.

In the late 1960s, C’est Si Bon is the music bar where every acoustic band’s dream lies. There Geun-tae, a naïve country boy, meets the young musical prodigies Hyung-joo and Chang-sik, and forms the band named after it — the C’est Si Bon Trio. As the three young artists bicker over their music, beautiful socialite Ja-young enters the picture and becomes their muse, and a series of moving love songs come from it. Geun-tae’s pure-heartedness wins Ja-young over but when she accepts a once-in-lifetime opportunity for a shot at an acting career, they part ways. After 20 years, the untold story of their love, song, and youth at C’est Si Bon is finally brought to light.