Korean actor Kim Seung-woo, who starred in blockbuster TV series "IRIS" last year, has joined the cast of its upcoming spin-off series "ATHENA", according to the show's producer Taewon Entertainment on Tuesday. Taewon announced in a press release that the actor will be reprising his role from the original series, playing North Korea's top intelligence agent Park Chul-young who holds the key secrets to solving the mysteries left behind by "IRIS".

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