Queen's Park Rangers says that Yun Suk-Young is "quick with and without the ball...a threat going forward...known for being able to handle the physical side of the game".
A player profile published on their website says he "promises to be a valuable addition to the R's squad".
Reading boss Brian McDermott praised a clinical second half performance which sent the Royals through to the last 16 of the FA Cup.
Brighton, Reading and Aldershot have some big matches this weekend in the Fourth Round of the FA Cup.
A football fan has put himself at the centre of a flurry of Twitter attention after betting his bank details on the outcome of a match.