A few photos of�Choi Siwon and Lee Si Young from behind-the-scenes of their new drama, 'Poseidon', have recently hit the web. The friendly duo are seen looking over their lines and script together from time to time between scenes. It's been said that the lines for 'Poseidon' are longer than most scripts because of its detailed investigation scenes. The two actors are spotted memorizing their lines together during standby, even taking quick moments to rehearse. Staff on set are reporting that Choi Siwon and Lee Si Young are becoming fast friends, as they share advice and constructive criticisms to make the scenes as natural in its flow as they can. An associate of Annex Telecom commented, "The set is always full of energy due to these intensely driven and energetic actors". Have you been keeping up with 'Poseidon'? What do you think of their acting so far? Source & Photo: Naver