What episode is the hidden corner cop dancing video in?

Episode 12. The clip is from the TV series "hidden corner" episode 12, plot summary: Yan Liang in the process of Zhu Chaoyang argument nearly fell into the water, he advised Zhu Chaoyang not to do stupid things, hope to sacrifice himself as a warning, Zhu Chaoyang finally did not kill Zhang Dongsheng, but Zhang Dongsheng obsessive ultimately was killed by the police, at the end of the fairy tale, Yan Liang was also rescued in time, and Zhu Chaoyang and Yan Liang together with the police confession After the whole thing, Zhu Chaoyang can finally return to normal life and study, in the opening ceremony, Yanliang found Zhu Chaoyang, they looked at each other but said nothing, Yanliang then straight away, sitting on the wall, watching the police Lao Chen and other people together square dance, as if everything this summer vacation is a dream.