The agency said Gong was offered the role of the man, but has not yet committed to it. Chinese actress and the director's wife, Tang Wei, will play the wife.
Other A-list actors have confirmed their roles in the movie, including Choi Woo-shik, Bae Suzy and Park Bo-gum.
It is director Kim's first movie in 10 years since the melodrama Late Autumn (2010). It will begin shooting in the first half of this year.
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