From left, actors Kim Sung-kyun, Lee Si-young, Kim Ah-joong and Kim My-yeol at a press conference for the upcoming Disney+ original series "Grid" on Wednesday. Seo Kang-joon, who is also part of the cast of "Grid," was unable to attend the event as the actor began his mandatory military service in November. Sci-fi mystery series"Grid" will premier Feb. 16 and one episode will be released every Wednesday until April 20.