Without hesitation, the members of Block B agreed when maknae P.O. called in for a favor to perform at the 'ROK Marine Corps Concert.'

A week ago, Block B member U-Kwon posted a photo on his Instagram story showing that the members of Block B had all gathered together at KOZ Entertainment's practice studio. This brought excitement to fans and anticipation for the group's comeback.

Then on December 14, Block B was seen performing together at the 'ROK Marine Corps Concert' for the youngest member P.O. 

The video of the group's performance was shared on various social media platforms, where fans were able to see Block B on stage together for the first time in a while.

Fans commented, "I'm so happy to see them, they are still so good," "I love seeing them on stage," "I can't believe they all came together," "This performance is crazy," "This is a walk down memory lane," "I'm so happy to see them," "I'm about to cry," "I wish they have a concert," "the song and choreography is still hip," and "Please make a comeback soon."