Doom at Your Service - S01E06

Watcher mengisahkan seorang detektif elite yang membentuk kelompok detektif untuk dalam negeri yang memberantas kasus-kasus korupsi di negara tersebut.

Dirinya merupakan orang yang sangat bijak dan cerdas. Ia pun memutuskan dirinya untuk jadi pemimpin di kelompok detektif tersebut.

Diperjalananya, ia menemui berbagai orang dengan berbagai latar belakang dan permasalahan, seperti seorang pengacara yang dipecat dan berhenti karena terjerat sebuah kasus.

Lalu perwira polisi yang dipecat dan keluar karena sebuah kisah perselingkuhan yang dialami dan mereka pun bergabung dalam kelompok detektif tersebut

Cellphone app Joalarm is created. If someone likes you and they are within 10 meters of you, the alarm for the app rings. The app also shows how many people like you, but the app doesn't reveal specific details on who likes you.

Kim Jo-Jo (Kim So-Hyun) is a high school student. She is pretty and smart. She seems like cheerful person, but her parents died when she was young. Since the death of her parents, Kim Jo-Jo has lived with aunt's family. Living there is not easy for Kim Jo-Jo. She doesn't download the app Joalarm.

Meanwhile, Hwang Sun-O is a popular male student at the same high school where Kim Jo-Jo attends. He is the son of a wealthy family, but he is not loved by his parents. His best friend Lee Hye-Young also attends the same high school. Hwang Sun-O notices that his best friend Lee Hye-Young likes Kim Jo-Jo. Hwang Sun-O wants to know if his friend really likes her, so he kisses her.

The story takes place at the beginning of the 19th century. Goo Hae-Ryung is a historian who tries to fight gender stereotypes as her work is often looked down on. She meets Prince Yi Rim.

Mo Seok-hee is an only child and her father runs the large company MC Group. She is beautiful, smart and rich. Mo Seok-hee appears like she is arrogant, but she struggles over her mother’s death. Her mother was killed 15 years ago. Meanwhile, Heo Yoon-do is a lawyer, but he doesn’t even have an office. He solves small problems of neighborhood residents at a restaurant. He is full of love. Miraculously, Heo Yoon-do is headhunted to join the TOP team at MC Group. The TOP team manages the affairs of the family who runs the MC Group. Their job includes covering up immoral or illegal behaviors done by the family.

In this zombie thriller set in Korea's medieval Joseon dynasty, a crown prince is sent on a suicide mission to investigate a mysterious outbreak.