In the poster, j-hope stands in the middle of the road next to an airport. He looks like he's giving himself up and follows the theme of self-sacrifice in his message, which says, "I'm okay as long as you shine."
As previously reported, the posters are likely for BTS' rumored drama, which was also rumored to be called 'Love Yourself'. The series is expected to tell each of the members' stories. The "Love Yourself" theme is scheduled to continue into 2018 as a follow-up to 'The Most Beautiful Moment in Life', 'Wings', and 'You Never Walk Alone'.
BTS are likely making a comeback this September with a new album under the "Love Yourself" concept, so stay tuned!