Son Moo-Han works as a managing director of an advertising company. An Soon-Jin lost her daughter unexpectedly and she works as a flight attendant. Eun Kyung-Soo is An Soon-Jin’s ex-husband and he is now married to Baek Ji-Min.
Daichi has served time for murder, and is now living a life without hope. One day he is suddenly told by his former love that he has an 8 year old daughter called Hana, who is suffering from leukemia. Although he is shocked, when it becomes clear he can save Hana by being her donor, fatherly love overwhelms him and he finds meaning in life again. However, a conspiracy leads to his arrest for murder. Unless he takes the transplant surgery scheduled in two weeks, he can’t save his daughter’s life. Desperate, he starts his great escape.
Cha Woo Kyung is a child counselor who works at a children’s center. Her life seems perfect since he is married to a great husband and is pregnant. However, her perfect life doesn't last long, when an accident changes her life. She then meets Kang Ji Hun, a detective who is hurt for hiding his troubling past but is strict toward criminals and believes they should be punished to the full extent.
An old stately inn stands in the heart of Seoul. It may be old, discolored, and weathered, but Nakwon Inn exudes old-world charms. As the typical cold uneventful winter comes to an end at the inn, guests start to arrive one by one as if each had promised to be present. Strangely and coincidentally, each one of them repeats Never Twice as they enter. The truth is, they all have a fateful reason to be there. What could have brought these individuals together? And what do they all have in common considering their long-term stay, assigned room numbers, gender, age, and hometown? The real reason for coming to Nakwon Inn unfolds.
Park Ji-sang, a surgeon, leads a double life. While he tries to save his patients' lives, on the other hand, he is also a vampire who constantly craves for blood.
Choi Kang-Woo is a former detective, but he now works as a veteran insurance investigator. He leads a team that attempts to reveal insurance fraud cases.
Three travel content creators competing to win a trip to space embark on the adventure of a lifetime, rolling the dice to decide where they'll go next.
Life is simple for Sasamoto Sawa, a young housewife, but when the adulteress Takigawa Rikako moves into her neighborhood, so too does a new world of sophistication and sex. After Takigawa is nearly caught in the act, Sasamoto covers for her during the ensuing aftermath, unwittingly involving herself with a handsome teacher named Kitano Yuichi — and discovering her own desires for extramarital passions.
Two musicians who retired from their musical careers for different reasons join together with a demanding and difficult genius conductor to form an orchestra against all odds. Although it requires a lot of hard work to form their orchestra, they keep chasing their dreams of doing what they love the most in the world and this gives them great satisfaction. Three young and old people with different personalities and life experiences gather together under a common dream and they find love and the room to forgive each other as they eventually earn each other’s respect.
Go Nam-soon, a young boy, constantly gets bullied by a group in his class. Later, one of his old rivals joins his school. Eventually, they are able to sort out their differences.
Woo Ah-Jin lives a luxurious life due to her wealthy father-in-law, but her father-in-law's finances become decimated and her husband betrays her. Woo Ah-Jin's life hits rock bottom. Park Bok-Ja is a mysterious woman and she hides her heartbreaking story. She brings about fierce hardship on Woo Ah-Jin.
After his father’s demise at the hand of Gaya Hotel Group, Han Yi Soo (Kim Nam Gil) has lived for one thing only: Vengeance. Ready to hatch a plan to bring down his nemesis once and for all, Yi Soo goes to extremes in not only changing his identity, but also his face. But there's a huge obstacle in Yi Soo's way: his inconvenient love for Jo Hae Woo (Son Ye Jin), the heiress to Gaya Hotel Group. Along with being enmeshed within an ill-fated love, Yi Soo's cover gets blown, which has him running for his life like his father once did. You either sink or you swim, but what if the water is full of sharks?
Hoon-Nam knows about love theoretically, but he rejects falling in love. Jung-Eum wants to fall in love, but, due to her difficult situation, she gives up on finding love. Hoon-Nam and Jung-Eum meet and develop a relationship romantically.
Kim Moo-Young wakes up to find he has become a zombie with no memories of his past. Witnessing the death of a Detective, he has assumed his identity to try discover the mysteries of his past. Meanwhile, Kong Sun-Ji works as investigative journalist who quits whilst investigating the 'Santa Killer' case. By chance the two are brought together and various circumstances lead to Sun-Ji working at Moo-Young's detective agency as an intern.