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.
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.
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.
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.
Lee Hyeong is a talented songwriter. He happens to connect people who are not good with love. Those include Hyeong-Gyeong who wants to become a singer, but she suffers from stage fright. Scully is a high school student. She helps Lee Hyeong's spirit. Chan-Young is a colleague of Lee Hyeong and he likes Hyeong-Gyeong, but in vain.