No formal offer has been made but according to Twitch, Josh Brolin is the lead choice [by the Studio] for Spike Lee’s remake of Oldboy. He’d be playing the Americanized version of the character Choi Min-Sik created in Park Chan-Wook’s classic. It's the story of a man who is imprisoned for "seemingly" no reason for many years, and then seeks revenge when he gets out. His journey for revenge is what will be told in the movie.
Brolin is a pretty decent option for this role [IMHO]if Lee’s version sticks somewhat close in tone and edginess to the original. Right now, it's uncertain as to whether the film will follow the Manga or the film which have significant differences. Twitch does warn that talks are in the earliest of stages and that no official offers have gone out, so they’re speculating on who else would be good for the role. Some names that have been thrown out are Denzel, Idris Elba, and Aaron Eckhart.
Who would be your choice for an Americanized version of Oh Dae-Su?
Oldboy is a 2003 South Korean film directed by Park Chan-wook. It is based on the Japanese manga of the same name written by Nobuaki Minegishi and Garon Tsuchiya. Oldboy is the second installment of The Vengeance Trilogy, preceded by Sympathy for Mr. Vengeance and followed by Sympathy for Lady Vengeance.