Super Junior member and now Maritime officer hunk Choi Siwon along with his co-star Lee Si Young had a friendly boxing match on the set of their new K-drama, 'Poseidon'. Lee Si Young who boxes in real life and has recently won an amateur boxing competition that took place in Incheon on the 20th made everyone nervous when she arrived on set. As soon as she saw the sand bag, she easily threw a few brilliant punches at the bag. The two are known to regularly throw around a few casual punches at the end of each shoot, and Lee Si Young's impromptu boxing lessons began grabbing interest. Choi Siwon is also a stellar athlete, and doesn't lose to his co-star in the least. The sexy star is well-known to have an impressive Tae Kwon Do degree, and he's more than worthy of being deemed as a quadruple threat with his alluring good looks, singing talents, his new acting career & his athletic abilities. Staff members commented, "The energy levels on set are high, due to these two. Their action scenes are grabbing viewers' attention, and the boxing scene with Lee Si Young was something worth looking forward to." Source + Photo: Chosun via Naver