TVXQ's Changmin will be joining the cast of SBS's "Athena: Goddess of War" alongside labelmate Super Junior's Choi Si Won. Changmin began filming last week, and he'll appear for the drama's 16th through 20th episodes. The idol/actor took on the role of a nuclear bomb specialist from the National Intelligence Service. Viewers will be able to see him for two hours in a row starting from 9 PM and 10 PM respectively, thanks to his leading role in "Paradise Ranch" as well. Changmin will be making his first "Athena" appearance in the February 7th episode. Source: Newsen