Sinopsis Drama Korea Room No. 9 mengisahkan tentang dua wanita yang nasibnya berubah ketika mereka bertukar tubuh, dan seorang pria yang memegang kunci nasib itu. Eulji Hae-Yi (Kim Hee-Seon) adalah seorang pengacara di sebuah firma hukum besar. Dia menyanjung orang yang memegang kekuasaan, tetapi memandang rendah mereka yang miskin. Eulji Hae-Yi melakukan apapun untuk memenangkan kasusnya. Dia akan segera menerima promosi ke mitra senior di firma hukum. Pacarnya adalah Ki Yoo-Jin (Kim Young-Kwang). Dia bekerja sebagai dokter. Dia tampak seperti pria sejati, tapi dia menyembunyikan kekejamannya.
Sementara itu, Eulji Hae-Yi bertemu terpidana mati Jang Hwa-Sa (Kim Hae-Sook) di kamar 9 di area kunjungan penjara. Di kamar 9, ketika Eulji Hae-Yi bertemu Jang Hwa-Sa, tubuh mereka dipertukarkan.
Room No. 9
- Also known as: Room Nine / Nine Room
- Genre: Fantasy, Legal, Mystery
- Episodes: 16
- Director: Ji Yeong-Su
- Writer: Jung Sung-Hee
- Network: tvN
- Release Date: October 6 - November 25, 2018
- Runtime: Sat. & Sun. 21:00
- Language: Korean
- Country: South Korea
Cast- Kim Hee Sun as Eul Ji Hae Yi
- Kim Young Kwang as Ki Yoo Jin
- Kim Hae Sook as Jang Hwa Sa
- – Jung Yoo Min as Jang Hwa Sa (young)
- Oh Dae Hwan as Oh Bong Sam
- Kang Shin Il as Eulji Sung
- Jung Suk Yong as Kang Sung Tae
- Kim Jae Hwa as Kam Mi Ran
- Yoon Ji Won as Song Han Byul
- Min Sung Wook as So Young Cheol
- Jung Won Joong as Ma Hyun Cheol
- – Yoon Joon Hong as Ma Hyun Cheol (young)
- Im Won Hee as Bang Sang Soo
- Lee Kyung Young as Ki San
- – Yoon Park as Ki San (young)
- Jung Jae Won as Ki Chan Sung
- Park Hyun Jung as Kim Hye Sun
- – Kim Si Eun (κΉμμ) as Kim Hye Sun (young)
- Jo Won Hee as Park Chul Sun
- Son Byung Ho as Kim Jong Soo
- Ahn Suk Hwan as Bang Sa Dal
- Jung Yun Joo as Han Hyun Hee
- Son Sook as Jang Hwa Sa’s mother
- Hong Suk Chun as Chef