BTS member Jimin topped the iTunes Top Song charts in 90 countries around the world with his new solo single, "Closer Than This," on Saturday, a day after its release, his agency said.

The digital single was at No. 1 on the charts in the United States, Japan, Germany, France and dozens of other countries as of 8 a.m., according to BigHit Music.

The tune is dedicated to ARMY, the band's fandom, in which Jimin promises he won't let go of "your hold" no matter what challenges arise.

The music video for the song provides fans with a nostalgic journey through Jimin's 10-year musical career.

On Dec. 12, the singer enlisted in the Army to perform his mandatory military service.

In South Korea, all able-bodied men are required to serve in the military for at least 18 months. (Yonhap)