Following rumors that he will be starring in the piece, Yoo Ah In′s agency Star K Entertainment told enews on January 22 that "Yoo Ah In has confirmed he will be appearing in the upcoming SBS drama Jang Ok Jung."
In reality, Sukjong was younger than Jang Hee Bin, meaning that Yoo Ah In and Kim Tae Hee fit their roles perfectly as they too stand five years apart with Kim Tae Hee being the older. The producers took into consideration this fact while casting the leads in order to make them more realistic.
The drama will be Yoo Ah In′s third period piece. He debuted as a child actor in Sharp, then appeared in Mighty Chil Woo in his first adult role in 2008 and scored a great success in 2010 with the drama Sungkyunkwan Scandal.
Jang Ok Jung is about the love story between Joseon′s fashion designer Jang Ok Jung and King Sukjong. It will air following the conclusion of Yawang on the third week of April.