Byung-gu, a once-famous former professional boxer, makes ends meet doing odd jobs at the gym. While eager to start boxing again, he gets diagnosed with "punch drunk syndrome," a condition caused by cerebral concussions. One day, a new member of the gym arrives and volunteers to help Byung-gu.

In modern-day Seoul, a crack team of investigative journalists fight for their careers after broadcasting a controversial story. With time running out, the team are given an impossible task if they want to save their jobs – solve a twenty-year-old cold case involving a famous actor who disappeared without a trace.

Hyun, a best-selling writer, has found himself in a slump for a long time. In the meantime, he accidentally meets Yu-jin, an aspiring young writer. Hyun gets confused when Yu-jin confesses his love to Hyun. A 19-year-old student and Hyun’s son, Sung-kyung, who is skeptical about his life, meets Jung-won, a young married woman living next door. Sung-kyung has a good feeling for this freewheeling woman. A pure-hearted man, Soon-mo, who is Hyun’s best friend and also the publisher, meets his friend’s ex-wife.

A fine arts student meets an attractive bartender, and the two women begin an intimate relationship.

A mother lives quietly with her son. One day, a girl is brutally killed, and the boy is charged with the murder. Now, it's his mother's mission to prove him innocent.