Ji Sung
In 2011, Ji Sung starred alongside Yum Jung-ah in "Royal Family", about the power plays within a chaebol family. Later that year, he was cast in the workplace romantic comedy "Protect the Boss". In a departure from his usual serious roles, Ji Sung played a dorky man-child with a panic disorder, who matures and learns to run his father's business after meeting a feisty secretary (played by Choi Kang-hee).