Nancy Sit Ka-yin is a Hong Kong actress on the TVB network. Her acting career dated back to the 1960s, when she was a popular teen idol alongside Connie Chan Po-chu, and Josephine Siao. Sit recorded many albums in her teens, and later served as a mentor to Anita Mui, who went on to become one of the biggest superstars in Hong Kong history.

Virtues of Harmony is a Hong Kong television sitcom produced by Tsui Yu-on for TVB, which originally aired on TVB Jade from 17 September 2001 to 28 December 2002. It stars Nancy Sit, Frankie Lam, Michael Tse, Joyce Chen, Bondy Chiu, Cutie Mui, Louis Yuen, Yvonne Lam, Johnny Tang, Bernice Liu, Lau Dan, Stephanie Che, Joseph Lee, Hawick Lau, Johnny Ngan, Helen Ma, Timmy Hung, Sherming Yiu, Kingdom Yuen & Maggie Shiu. The series, set in the fictional town of Chi Lik Kung Tsan, revolves around the Kam House, a new rich family during the reign of the Chenghua Emperor. The story is inspired by the 2000 TVB comedy drama Colourful Life.