BTS, Second Gyeongbok Palace Stage on the 2nd Oct.

While BTS was singing "Mikrokosmos," a logo symbolizing "Army" was seen in the night sky above Gyeonghoeru, National Treasure No. 224 in South Korea.

It was on NBC's "The Tonight Show Starling Jimmy Fallon."

BTS sang "Map of the Soul: Persona," a song from last year's album, at the Fallon Show, which aired on 2nd.

This is the fourth day of "BTS Week," a special five-day run by Fallon Shaw.

Standing in Gyeonghoeru BTS members sang "Mikrokosmos" sweetly in a free atmosphere.

Under the night sky, Gyeonghoeru lit up creating a picturesque scene.

At the end of the song, a logo symbolizing "Army" was embroidered with light in the sky.

For five days, BTS has released different performances every day since the 29th of last month through the Fallon Show's "BTS Week."