Seoul was visited by some superheroes on April 17-or at least the actors who play superheroes in the new film "The Avengers: Age of Ultron." Some of the film's cast and crew returned to Korea to promote the film that was partly shot there.

One of the returning film actors was Korean actress Kim Soo Hyun, who is known in the U.S. as Claudia Kim.

Kim Soo Hyun attended the April 13 Hollywood premiere along with director Joss Whedon, actors Robert Downey Jr., Chris Hemsworth, Chris Evans, Scarlett Johansson, and Mark Ruffalo.

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