In which episode did the chef discover that there was gutter oil in the dishes?

In the 29th episode of the TV series "The Kitchen", gutter oil was found.

"The Chef" is a romantic drama produced by Benshan Media Company, starring Xiao Shenyang, Hai Qing, Jiang Tong, Zhao Zheng and others. The TV series mainly tells the joys and sorrows, personal troubles, life ideals and their own troubles of the chefs in the hotel kitchen. There are also chefs’ cooking competitions and love stories interspersed in the middle.

Xiao Shenyang plays Shi Huibao, the hotel's new chef. He has always been polite in front of the original chef Xu Bing and especially likes children. His humor also influenced Xu Bing, who had a cold personality, making her smile more and more.

Hai Qing plays the role of Xu Bing, the hotel chef. She is an older leftover woman with a cold personality. She is very prestigious in the kitchen and everyone will treat her with respect.

In episode 29, Shi Huibao told Xu Bing that the hotel purchasing staff had entered gutter oil, but Xu Bing did not believe it, so Shi Huibao resigned angrily and went to work at a food stall. After Shi Huibao left, Xu Bing found out that there was indeed something wrong with the oil in the store, and asked the person who bought it to confirm that he had wronged Shi Huibao.

Thankfully, Shi Huibao bought oil in advance before leaving, so the hotel could serve food normally.