Seo Yi-Gang is the best ranger at Jiri Mountain National Park. She knows virtually everything about the area, including where to climb the mountain. Kang Hyun-Jo is a rookie ranger at Jiri Mountain National Park. He graduated from the military academy and was once an army captain. He has a secret that he can't tell anyone about. These two people become partners and they work to save people around Jiri Mountain National Park.

Tragedy, betrayal and a mysterious discovery fuel a woman's vengeance for the loss of her tribe and family in this special episode of "Kingdom."

A mermaid from the Joseon period ends up in present-day Seoul, where she crosses paths with a swindler who may have ties to someone from her past.

A resistance group in Japanese-occupied Korea breaks a sniper out of prison to carry out an assassination, unaware that a traitor lurks among them.

An alien who came to Earth 400 years ago is almost able to return to his own planet, but when he meets a famous actress, he doesn't want to go home.