On November 1, the production company of 'Four Sons' revealed that Lee Ki Woo will be acting as the character Kang Il Kwon. The new series is said to be a romantic/fantasy-mystery drama.
Prior to this, actor Jo Hyun Jae was cast for the role but opted out due to conflicts in his schedule.
A representative commented, "The showdown between the blood brothers is something to watch out for."
With the completed cast, the actors are set to begin filming in December.