The Secret Romantic Guesthouse - S01E18 - The Secret Romantic Guesthouse 1-18

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.

Lee Jae-Sang (Rain) is a lawyer at JK Law Firm, which is one of the biggest law firms in South Korea. He is an excellent lawyer, but he only cares about winning for his benefit. One day, he has a mysterious car accident and he is drawn into a parallel world. There, Lee Jae-Sang finds himself working as a prosecutor. He is strict in carrying out the law. He is married to Ra Shi-On (Lim Ji-Yeon), who loves Lee Jae-Sang and is faithful to him. In the world where Lee Jae-Sang came from, he broke up with Ra Shi-On ten years earlier and Ra Shi-On works as a detective. Lee Jae-Sang struggles to cope with his different selves.

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