Ancient Korea, July 4, 1762. The Crown Prince Hyojang, posthumously named Sado, son of King Yeongjo of Joseon, is accused of treason. Thus, the king asks him to commit suicide, but his closest vassals prevent it, so the king orders the prince to get inside a wooden rice chest, where he suffers deprivation of food and water.
Hong Seol, a student from a poor family, meets a rich Yoo Jung, who is her senior at her university. They both develop a rather inconvenient relationship after knowing each other.
Dreaming of making a way station for his sister and the villagers who have no choice but to commute along the dangerous train tracks every day, Joon-kyung sends many letters to the President, but with no reply. Ra-hee, who has a crush on Joon-kyung, does everything she can to help him meet the President.
Jin-hyeok opens a cake shop in an old antique shop, hiring Seon-woo, Korea's best pastry chef, who fell in love with him in high school. Also there, are Su-young, crushing on Seon-woo, ex-boxer Ki-beom, and Seon-woo's French ex-boyfriend.
Young-seok, who feels overwhelmed and lonely in what should be his glorious youth, meets a woman who introduces herself as Josée, and they share a once-in-a-lifetime romance.
Ji-woo, an outcast at a prestigious private school, meets Hak-sung, the school janitor who is actually a mathematical genius who defected from North Korea.
A woman's past as a convict follows her everywhere and because of this she doesn't open up to others. But then she strikes up a friendship with a broken child who has suffered from domestic violence and decides to save the girl from the cruel world. A man who holds feelings for the woman, tries to protect her in his own way.
Major crimes unit detective Seong-jin arrests Tae-sung for petty crimes, but shocked to find out that he is the notorious serial killer. However, Seong-jin becomes doubtful of his identity as the serial murder case is investigated.
Hyun-tae, In-chul and Min-soo have been best friends since childhood. Their relationship is forever changed after Hyun-tae's mother asks In-chul to commit insurance fraud by destroying her arcade.
An expelled boxing champion, who now is a high-school teacher, witnesses intolerable violence and throws her first punch to build justice against it, while putting on a mask.
Four different couples have a romantic week over New Year's Eve. Both coming out of failed marriages, Ji-ho and Hyo-young are not open to the possibility of new love, while Jin-ah heads to the other side of globe and encounters Jae-hun.
So-young, an elderly prostitute working in Seoul, tries to take care of a young Korean-Filipino child she meets in a hospital and make ends meet. So-young's life takes a dark turn when several of her old clients try to reconnect with her.
An assistant to a TV producer, eager to stay off his bad side, promises to convince her former professor, a famous but reclusive academic, to appear on their show, which helps locate long-lost persons. Who does grey-haired Professor Yun Suk-Young want to see again more than anything? The answer to that question lies decades in the past.
Joon-seok is sent to prison for his involvement in Dong-soo's death. He meets Dong-soo's son in prison, keeps his identity a secret, and agrees to join forces when he is released. All of their plans fall apart when Sung-hoon finds out the truth.
The probability of a couple that had broken up getting back together and having a successful relationship is just 3%. Dong-hee and Young, who had broken up over a minor tiff, later realize their love for each other and end up getting back together. But will they be able to fit into the 3% bracket?
Seoul, South Korea, September 21st, 2008. Eight citizens, the first to intervene as jurors in the country's legal history, are randomly selected to examine a matricide case that appears to have been resolved due to the existence of apparently conclusive evidence.