Which issue of 20 17 did the singer Li Jian attend?

Singer 20 17 Li Jian participated in the 13th issue. Through the inquiry of Entertainment Focus Network, singer Li Jian Yun-peng Yue participated in the 13th issue of 20 17. The broadcast time of this issue is April 20 17 15. This issue is a duet, and Yun-peng Yue is here to help sing Li Jian. Singer is a musical competitive program launched by Hunan Satellite TV and produced by Hunan Satellite TV Program Center. The first three seasons are all 14.