Ji Hong is a doctor who decided to become a high school teacher. He meets Hye Jung, a reckless student who happens to be his favorite neighbor's granddaughter and turns out to be his student. Their deep relationship led them to be accused of being in a romantic student-teacher relationship. 13 years later, they suddenly bump into each other under neurosurgery in the same hospital. Hye Jung is determined to avenge her grandmother's death due to medical malpractice, as Ji Hong is out to protect his highschool sweetheart. In between, they face numerous challenges in the operating room, within their relationship, and the political disputes within the hospital and its investors.

Everyone thought he was a genius, but Jin Woo was suffering from Hyperthymetic syndrome. His memory could remember every single detail every day. Jin Woo faces another tragedy; his father was falsely accused of murder. With his ability, Jin Woo becomes a lawyer to save his father from being wrongfully executed for murder. He uses his condition to his advantage, but the odds seem firmly stacked against him when he develops Alzheimer's. Will he be able to prove the innocence of his father?

Kim Woo Hyun is the only son of a high-ranking police officer. He breezes through the police academy and graduates from it with honors. After being assigned to the cyber investigation department, Detective Kim finds himself entrenched in a cat and mouse game with a faceless enemy in the cyber world. Tirelessly hunting down the hacker, alias of Hades, he finds out that Hades is his past roommate in the police academy, Ki Young. Ki young is caught. But he escapes and tries to find an evidence proving his innocence. Meanwhile, Woo Hyun tries to reveal the secrets of those that hide within the cyber world.

Gye Baek was born as the son of Mu Jin, a student and guard of Baekje's King Mu, but because of his father being falsely accused, he grew up as a commoner in the market streets.There, he meets a merchant named Eun Go and he falls in love with her. One day, after getting caught up fighting in the mountains, Gye Baek is lowered to become a war slave and becomes a prisoner of war for Silla. At Silla, he reunites with Uija who came as an envoy and learns there is a great secret about his father's death. Though King Uija and Gye Baek have a strong friendship, they both have feelings for Eun Go at the same time. Gye Baek's loyalty to Baekje and King Uija completes a history page. What will the situation be in the relationship of Uija and Gye Baek with Eun Go in between?