Wanna One marked the launch of its reality show, “Wanna One Go: Back to Base,” in a meet-and-greet event with fans in Seoul on Monday. Nine members of the 11-piece act assembled for the “opening ceremony” at the exact venue they used to exchange greetings with fans when they participated in the second season of K-pop competition “Produce 101,” donning gray uniforms that hark back to the 2017 show. Kang Daniel and Lai Kuanlin were absent — the former as he has enlisted for his mandatory military