On January 14th, Dynamic Duo's Gaeko celebrated his 31st birthday along with his fellow groupmate�Choiza and their mutual friends.

Choiza tweeted a two-set photo of their small party and wrote, "Our Gaebeoji (a.k.a Gaeko) even celebrates his birthday in the practice room. Happy Birthday -- and I love you, Kim Yoon Sung (Gaeko's real name)".

Netizens spotted�Supreme Team's Simon D crouching beside the birthday boy, who got frosting smeared on his face.

In related news, Dynamic Duo will be taking part in the '2012 Amoebahood Concert', which will be held at the Seoul Olympic Park on January 27th and 28th.

Source + Photos: Choiza's Twitter