Adapted from the novel "Your Presence at 18" (열여덟 너의 존재감) by Park Soo Hyun (박수현)

With each day feeling hopeless and bleak, Kang Jin's life takes a dramatic turn when he stumbles upon a lost envelope of money belonging to Rang. Using this newfound wealth, he takes a stand against Nam Young's girlfriend Da-young. But when Nam-young discovers Kang-jin's actions, he strikes back by stealing his money and issuing dangerous threats. With nowhere to turn, Kang-jin confides in Rang, who reveals a secret knowledge of the debt-collecting world. Together, they embark on a thrilling journey of power and control, as Kang-jin takes his first steps into the world of loan sharks.

It is often said that athletes die twice. Former boxer Park Si-heon feels like he has already experienced both deaths: first, when he won the most controversial gold medal of the 1988 Olympics and second, when his career ended in disgrace because of that very gold medal. Now on his third life as a hardheaded small town teacher, he is badgered by the principal to coach the school's boxing team. While reluctant at first, Park becomes determined to get the team into shape upon meeting Yeon-woo, a potential boxing star. Together, Park and his underdog team set out to prove that they both have what it takes to be a true champion.

Two ex-lovers navigate their lives post-breakup — struggling to redefine their relationship, from partners to strangers and everything in between.

Faced with real-world opportunities and challenges, a couple endures the highs and lows of trying to make a long-distance relationship survive.

One day, 25 years ago, missing Chun-bae's letter is delivered to his cousin, Jjang-goo. The letter contains Chun-bae's lover, Bok-soon, and other people's letters. Jjang-goo finds Bok-soon to deliver the letter and meets class president Jang together. The three people recall their memories from 25 years ago, and eventually faced the person who sent the letter. Through that, the tangles begin to unravel.

Jung-yeon receives a tip-off that her son who went missing six years ago is in a fishing village. Local officers get in her way, trying to cover up a secret that might be related to her case.

A mother who just lost her only hope, daughter, made a critical decision. On that day, she happened to live a life which the time goes back to one day before every day. During the time traveling, she gets the second chance for her life.

In-gyu has intellectual disability. His mother, Ae-soon, takes care of him, nagging him all the time. One day, she is diagnosed with terminal cancer and prepares for her son's independence.

Soo-kyung works as a reporter. She has an older brother, Sung-ho, and younger sister, Joo-mi. She thinks of her two siblings as burdens. One day, Nak appears in front of them. He is their youngest sibling.

Il-bum works hard to pay off his daughter’s hospital bills but one day gets fired for being wrongly accused as a molester. After series of failures, Il-bum finds a job at a PR company which provides free entertainment to old women in exchange for buying their products. Il-bum feels shameful to play dirty tricks on old women but he has no other choice. Despite his initial concerns, Il-bum starts to feel a sense of worth entertaining old women. A new team member, Ok-nim joins and Il-bum becomes a good friend to her, making her feel warm and safe which she never gets from her own son. But, the joy of their friendship won’t hold long when Il-bum’s debt reaches beyond help.