Jin returned to Korea on the afternoon of the 31st after finishing the Argentina schedule through Incheon International Airport. On this day, Jean wore a mask, dressed somewhat modestly, greeted the reporters, and calmly left the arrival hall. Jin sang along to Coldplay's band on the stage of "The Astronaut," which was directed in a space atmosphere, and then sang the chorus with perfect harmony with Coldplay. Since then, Jean has embraced Chris Martin with a hot embrace, communicating and radiating free energy throughout the stage. 'The Astronaut' is an impressive combination of a calm acoustic guitar in the pop rock genre and a slowly rising synth sound. "The Astronaut," which includes Jin's love for Ami (BTS fandom) by participating in the songwriting, is a song that shows the face of vocalist Jin, and Coldplay participated in the collaboration, maximizing the atmosphere of the song, which is refreshing and dreamy with Jin's unique sensibility. On this day, Jean said, "I always greet you with the members, but I am shy and nervous because I greet you alone." "I have been making songs for my birthday, It is a public song for fans, BTS Solo song, but it is the first time that an album of my name has come out. On the other hand, many people are excited about how to listen to the song. "I prepared the Solo single and once again felt the importance of the members."