[3] Jung also starred in a series of television commercials for Hong Kong-based retail chain Mannings, in which she trains with an overweight cat mascot.

Because she made her weight loss experience public on the Internet column, it became a hot topic and caused a great response in South Korea.

It also led to the birth of words such as "몸짱 (Mom-jjang, the most perfect body)" and "S라인 (S line, S curve)" which symbolizes the ultimate female beauty.

In January 2019, the probiotic enzyme tablets and other weight loss products endorsed by Zheng Duoyan, "Dayeonsu", were found to contain laxative ingredients by the Yunlin District Prosecutor's Office.

Since the product contained Western medicine laxative ingredients and was not manufactured with the permission of the health authorities, it clearly violated the Pharmaceutical Affairs Act.