B1A4 will be filming 'Knowing Brothers'.
It's been a while since the boys have been active as a full group. Baro and Jinyoung have been busy with dramas, CNU has been in a musical, Gongchan has been in variety shows, and Sandeul has had OSTs. They'll all be coming together on the 31st to film the JTBCvariety show.
Make sure to catch the episode in September.