What issue of the fourth season is oo?

Seventh issue. According to the relevant content of the talk show in the fourth season of Informal Talks, there is oo in the seventh issue of the fourth season. Oo appeared in the seventh issue of the fourth season of Informal Talks. Due to the absence of Russian representative Sasha and Turkish representative Don Xiao Qiang, an old representative will return to join the one-day representative for four consecutive times.