It is the first season to this season so you may need to watch this before to understand the full story

I would recommend this because it is extremely fun to watch them going to a different place and experience different things. if you enjoyed this I would watch series 2,3 and 4.

It is similar because they are both shows by idols. EN-O;CLOCK (33 episodes), TO DO X TXT (79 episodes) and season 2,3 and 4 (156 episodes altogether) of Run BTS are all shows done by k-pop idols. But you may have to get to know a bit about these groups to actually be able to watch them otherwise some of it may not make sense.