About a series of mysterious incidents that are connected to an incident that took place in a village 28 years ago.

Do Jung Woo is a capable and legendary team leader of a special task force at the National Police Agency. He has messy hair, a constant slouch, and sucks on a lollipop all day like a kid, but he has a mysterious secret behind his sly exterior.

Gong Hye Won is a passionate police officer who does not let anything get in her way. Behind her pretty face is a hot temper that won’t cool down unless she says what she needs to say. She is one of the strongest and best fighters on her team, and can drink the others under the table, but she also has a surprisingly clumsy side.

Jamie is a detective on loan from the FBI. She was adopted as a child with almost no memories of her life before, but she returns to Korea to solve the serial killer case that is related to those lost memories from 28 years ago.

Computer science major Chu Sang Woo is the epitome of an inflexible and strict rule-abiding person. While working on a liberal arts group project with freeloaders who don’t put in any effort, Sang Woo reasonably decides to remove their names from the final presentation.

But he didn’t imagine how involved he would become with the person whose study-abroad plans were messed up because of that project. The involved person: the campus star who everyone knows, Department of Design’s Jang Jae Young. He has everything from skills, looks, family background and good relationships except for 1 big problem: Chu Sang Woo.

What happens when an engineer and an artist whose personalities are like oil and water have to work together? Jang Jae Young is like a semantic error in the perfect world of Chu Sang Woo. Will Sang Woo be able to debug this?

Adapted from the web novel "Semantic Error" (시맨틱 에러) by Jeo Soo Ri (저수리).

In the Nanyang region in the 1930s, Ouyang Tian Qing and Kuang Cai Yun traveled from Guangdong to Southeast Asia to make a living. Tianqing became the "samsui woman" of construction site labor and became the leader of the sisters. She was admired by both the rich Jia Fu and the poor A Le. Cai Yun accidentally became acquainted with the young Hu Yaozu and became the nanny but was repeatedly bullied by the Hu family. Yao Zu drove her away to protect her and went to study abroad.

A Le took the initiative to give up his feelings for Tian Qing and went to serve as a soldier during the Japanese invasion. The Japanese forces forced Tian Qing and her company to build the shrine. On the day of completion, Ale, who joined the rebels, led the people to rescue Tian Qing and burned down the shrine. Cai Yun, who suffered various changes, also waited for the return of Yao Zu.

Retired principal Chung King Fai returned to Hong Kong from Canada in order to search for the soprano voice on his mind. He returns to the rebuilt Ngau Tau Kok Estate. His granddaughter, the reclusive illustrator Jacqueline Wong, promises to help him find his former students from the elementary school choir from forty years ago. The divorced Jacqueline, with the help of her investigator friend and "fake husband" Owen Cheung, and former students Hugo Ng and Mimi Kung, finally finds the other members - Ram Chiang, Joe Cheng, Sam Tsang, Willie Wai, Jimmy Au, Savio Tsand and former music teacher Lo Koon Lan - and reunites the choir. But these middle-aged men, who have experienced life's hardships have become like oily fried sticks who have lost hope in life. In the process of searching for the soprano, Jacqueline and Owen develop a subtle relationship, while the middle-aged men rediscover their passion for life and shine on the stage once again!

A year after parting, a successful Woong and Min-chae meet again! They don't have money, but they stick together all the time and get ready to be married.

This drama is about a gifted young man learns medicine out of a desire to avenge his father who was brutally murdered fifteen years ago.

Kang In Kyu (Go Gyung Pyo) ‘s father was brutally murdered 15 years ago. To take revenge on those who are responsible for his father’s death, he becomes a doctor. He volunteers at a prison medical office where the murdered is imprisoned.

Sakurai Taro’s parents died young. His grandmother, Akiko, has been making great effort to protect her struggling candy store, Sakuraya, in the old part of Tokyo, but it's not easy. Taro eats candy with regular customers such as chilhood friend Saegusa Hiroki who aspires to be a scriptwriter, and talk nonsense, like in their youth. However, they realize this unfettered, comfortable existence will end some day with the passage of time. Then Taro’s ex-classmate, Kimura Reiko, comes back home with her son after a divorce. He and his friends start to notice what is truly important to them as they face up to their pasts, dreams and pains.

Chun Chang Sheng was abandoned in a flowing river and plucked up by a Taoist monk. He’s actually the fourth Prince of the Chen’s Royal bloodline. He’s plagued with an incurable illness, fated not to live past the age of 20. To find a cure, he leaves his temple, armed with a promise of marriage scroll, to become a student at a famous academy. He meets Xu You Rong and they slowly fall in love after hopping through the trials and tribulations of his journey.