[INFO] 110217 Poseidon's Main Cast

(From top, left to right)

Kim Kang Woo
Moon Jung-Hyuk (Eric from Shinhwa)
Uknow Yunho
Kim Ok-Bin
Jeon Hye-Bin
Kim Yoon-seo
Kim Kap-Soo
Son Hyeon-joo
Park Won-sook
Jin Hee-kyeong
Kim Jae-woo
Kim Young
Lim Gi-Hyeok
Park Sung Chan

Source: baiduTVXQ
Translation: kimuchi3005 @ OneTVXQ.com
Credits: OneTVXQ.com { One World. One Red Ocean. One TVXQ! }
Feel free to repost, but please leave the full credits intact. Thanks!