Deep in the Realm of Conscience
- Title: 深宮計 / 深宫计
- Cantonese/Mandarin title: Sum Gong Gai / Shen Gong Ji
- English title: Deep in the Realm of Conscience
- Genre: Period, romance
- Broadcast network: TVB
- Broadcast period: 2018-May-21 - 2018-July-7
- Opening/Closing Theme Song: No Regrets (無悔無愧) by Nancy Wu
- Related TV shows: Beyond the Realm of Conscience, Can't Buy Me Love
After Prince Ping (Steven Ma) stops the usurp schemes of Empress Wei (Michelle Yim), his father ascends the throne as Emperor Ruizong, and Prince Ping becomes Crown Prince. Eventually, Emperor Ruizong abdicates the throne and the Crown Prince rises to the throne as Emperor Xuanzong. Even though the schemes of Empress Wei are over, the women around Xuanzong begin their schemes for power in the palace.
- Nancy Wu as Empress Wong, Wife of Emperor Xuanzong
- Annie Liu as Yuen Yuet, a maid in the Imperial Household Bureau
- Steven Ma as Emperor Xuanzong
- Kenneth Ma as Yan Samsu
- Edwin Siu as Ho Nan
- Alice Chan as Princess Taiping, Sister of Emperor Ruizong. Aunt of Emperor Xuanzong
- Chrissie Chau as Cheng Sunhei, Imperial Concubine Cheng of Emperor Xuanzong
- Lee Lung Kei as Emperor Ruizong. Older brother of Princess Taiping
- Rosanne Lui as Consort Yin, Emperor Ruizong's consort
- Mary Hon as Consort Suk, Emperor Ruizong's consort
- Eric Li as Prince Song, Emperor Ruizong's son. Xuanzong's half-brother
- Sharon Luk as Princess Consort Song
Imperial Household Bureau
- Susan Tse as Jeung Kingheung, Imperial Household Bureau Chief
- Akina Hong as Namgong Kam, Imperial Household Bureau Head of Furnishing
- Angie Cheong as Luk Bikwan, Imperial Household Bureau Head of Attire
- Candy Lo as Tsui Seungsi, Imperial Household Bureau Head of Jewelry
- Pinky Cheung as Wong Mun, Imperial Household Bureau Head of Culinary
- Jacqueline Wong as Imperial Household Bureau Maid of Furnishing, Yuen Yuet's close friend.
- Producer: Mui Siu Ching
- The returning cast members from Beyond the Realm of Conscience are Edwin Siu, Susan Tse, Rosanne Lui, Mary Hon, and Michelle Yim
- The Jyutping title of Deep in the Realm of Conscience (Sum Gong Gai) is a rearranged title of Beyond the Realm of Conscience (Gong Sum Gai).
- This is the first time Annie Liu participated in a TVB production.