Wanna One will be collaborating with BoA.
Both BoA and Wanna One will be at '2017 MAMA in Japan', and BoA and an unrevealed Wanna One member will have a collaboration stage. Reportedly, it's a member BoA picked herself for the collaboration.
As 'Produce 101' season 2 viewers know, BoA and Wanna One have quiet a deep relationship as BoA was the main host for the second season and had given the boys a lot of advice as well.
Who do you think the member will be?