Wang Hailin (), executive director of Chinese Television Series Screenwriter Association, testified as expert witness for Chiung Yao's camp. On December 12, 109 Chinese screenwriters published a joint statement supporting Chiung Yao's lawsuit against Yu Zheng. A day later, an additional 30 Chinese screenwriters made their support of Chiung Yao known. Yu's 2006 drama "Concubines of the Qing Emperor" () had been suspected of plagiarizing the Hong Kong drama "War and Beauty" (2004). Yu denied it, but stated that his drama "contained the successful parts of classic dramas like "War and Beauty", "Dae Jang Geum", and "Winter Sonata"". Yu's 2011 hit drama, "Palace" was allegedly a plagiarism of several well-known television series/novels, including Tong Hua's "Bu Bu Jing Xin" as well as the Taiwanese hit series "Meteor Garden". On June 3, 2014, writer Tong Hua accused Yu of not only consistently "consulting" her work but also telling the public that others were plagiarizing him. Tong Hua threatened legal actions if Yu continued his false claims. Writers Fu Xing () and He Zizhuang () have claimed that in 2003, Yu Zheng and Fu Xing co-wrote a script for the drama "Take Me to Fly, Take Me for a Walk" (). Whereas Fu came up with all the characters and relationships, Yu claimed all the credits when he published the script as a book. Yu later wrote an apology letter to Fu, who forgave him. Yu also offered to compensate Fu ¥30,000 but never did. On May 6, writer Li Yaling (), who co-wrote 2 Yu Zheng dramas "Pretty Maid" (2010) and "Spell of the Fragrance" (2010), offered to be a witness to support Chiung Yao's lawsuit. She claimed that back in 2008 Yu had asked her to "borrow" "Plum Blossom Scar"'s story for a new script, but she refused. Li Yaling further claimed that Yu had copied scenes from the Singaporean drama "The Little Nyonya" (2009) for "Pretty Maid", an action that also damaged her reputation because she was listed as the writer. She also claimed that Yu Zheng once told her that as long as plagiarism does not exceed 20% then the courts would have no case. Another writer Zou Yue () also claimed to have heard the "20% rule" from Yu Zheng. On March 12, 2015, Yangzhou Intermediate People's Court accepted a plagiarism lawsuit filed by author Zhou Haohui () against Yu Zheng and others, for allegedly plagiarizing from his novel "The Evil Hypnotist" () for their 2014 TV series "Cosmetology High".