"The Astronaut" is a bilingual pop song where Jin sings of his love for his fans. Throughout the dreamy tune, he uses a cosmic motif to speak of his affection for and relationship with Army (BTS' official fanbase).
"I wrote the lyrics," Jin said in a video
. "I expressed how I feel about Army who made me who I am as the Jin of BTS. The lyrics are also about me, who flows aimlessly, and you, who find Army. I'm thankful and affectionate for Army who made me shine everywhere."