Hi there! :)
I think watching BtoB’s The Grand Launching Show is the best way because there are introductions for each of the members. If you’re specifically looking for shows, BtoB have been on many of them. I’ve found a great list which compiles all of their variety and reality shows (with English subs as a bonus haha). You can find them here and here!
I hope this helps! If not, you’re welcome to drop by in our ask box again! :3