On March 3, 2011 TS Entertainment revealed that Bang Yongguk will be the featured rapper in Song Jieun's "Going Crazy".
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In March 2011, he was featured in Song Jieun's Going Crazy and the single became a number one hit in South Korea.
The Big Bang Theory | Big Bang | Chitty Chitty Bang Bang | Jin Yong | Bang | Chitty Chitty Bang Bang (film) | American Bang | Kiss Kiss Bang Bang | Bang Records | Bang Kapi District | Wu Yong | Johnny Yong Bosch | Chitty Chitty Bang Bang (musical) | Bùi Bằng Đoàn | Big Bang (South Korean band) | Bang Tango | Ri Yong-ho | Francis Hong Yong-ho | Chiddy Bang | Cao Bằng Province | Bang & Olufsen | BANG! (Cinema Bizarre album) | Bang Bang (My Baby Shot Me Down) | BANG! | Anton Christian Bang | Andreas Bang-Haas | Yong Nyuk Lin | Ruyi Jingu Bang | Phong Nha-Kẻ Bàng National Park | Kim Yong |
The title song is the first time he sang a soulful ballad, and actress Ku Hye-sun appeared in the music video, which depicts the agony after a break up.
This is different from the concept of state (guk or Sino ko: 國, walled-town state, etc.) in the discipline of Korean History.
"Y.BIRD from Jellyfish Island With Seo In Guk" is the eighth digital single by South Korean singer, Seo In-guk.