'K-pop Star 2' contestants Akdong Musician have become the 'nation's little brother-sister duo' by achieving another instant hit with their latest self-composed song "Crescendo".

"Crescendo" landed at the top of Soribada's weekly chart for the second straight week in March, overcoming hot comebacks from Girl's Day, Jung In, and more. Their previous hits "Don't Cross Your Legs" and "You're Charming" have also previously ranked #1 on music charts. Taeyeon's "And One" for the 'Wind Blows In Winter' OST trailed behind in 2nd place.

A Soribada representative stated, "It's a rare feat for audition show contestants to rank #1 with their own song."

Congrats to Akdong Musician! Check out the duo perform "Crescendo" live below.