SEVENTEEN's One Fine Day: 13 Castaway Boys is the first season while SEVENTEEN's One Fine Day in Japan is the second season.
Unlike OFD in Japan, the staff are much more cruel on the first season as they just let the boys fend for themselves in an unknown province. SEVENTEEN showcased their survival skills and gained various experiences. It's a great show to get to know the members from their rookie days.
On the second season (OFD in Japan), they were divided into 2 teams, the hyung team and the dongsaeng team, and they were given missions everyday. Nevertheless, this season feels much more like a trip and the members were able to enjoy the beautiful Akita, Japan. Compared to Season 1 which shows more of their labor skills and humor, Season 2 showcased their analytical and leadership skills and child-like personalities.
Both seasons are amazing and fun to watch, regardless if you're a fan or not!