Rumors have surfaced online about how Super Junior's Choi Siwon is in a relationship with actress Kim Yoon Seo. On December 9th, a source revealed to Star N Financial News, "Super Junior member Choi Siwon and actress Kim Yoon Seo are in a relationship". The two met back in September through their KBS drama, 'Poseidon'. According to the source, they got close during the course of the shoot, and began dating 2 months ago. In response, representatives of both Siwon and Kim Yoon Seo's agencies have denied the rumors. Siwon's agency told Mydaily, "The relationship rumors with Kim Yoon Seo have popped up out of nowhere and are absurd. It is definitely not true... They were friendly with one another while on set, that is probably why [that person] thought that." Yoon Seo's agency stated, "Kim Yoon Seo is currently filming so we haven't been able to confirm with her, but they were close on the set, which is probably how the staff on the set misunderstood." Source + Image: Financial News, Mydaily