In Jeju, a spirited girl and a steadfast boy's island story blossoms into a lifelong tale of setbacks and triumphs — proving love endures across time.

With a genius-level IQ, Woo Young-woo learns to embrace her extraordinary self while forming a tight-knit community of friends and allies.

A police station and a fire station adjoining each other cooperate in combating crime and fire in the most brutal and tragic cases.

As a killing resembling a cold case resurfaces in a small town, the chase for the truth falls on two policemen who each harbor secrets of their own.

Accused of killing her husband, a woman is offered a way out by a mysterious stranger: in exchange for a confession in her place, she must commit murder.

Ji-O has a special power and a secret, but he doesn't know who he really is. He is chased by mysterious figures, while he tries to find answers to numerous questions that surround him. Goo-Reum is a detective. When she decides on a course of action, she won't change no matter what. Her parents disappeared when she was only a young child. Goo-Reum chases after the truth behind her parents' disappearance. She meets Ji-O and her life changes.

Kang Woo-ram is busy preparing to get a job. Lee Hyun-ji is a would-be anchor, but she works at a homemade hamburger restaurant. One night, Woo-ram visits the hamburger restaurant and orders a double patty hamburger, which has a "buy one, get one free" sale. This is how their relationship begins.

Kyung-ah works as a caregiver and lives alone. The only one she can rely on is her daughter, Yeonsu, but it's hard to see her after her independence. Meanwhile, Yeonsu, who was suffering from his ex-boyfriend, argues with him again and heads home. After Yeonsu left, Kyung-ah receives a shocking message.