Cha Muwon of Protect the Boss (보스를 지켜라)

procure a job, comes to serve the delinquent superior Cha Jihun (played by Jisung), of a mega corporation after much twists and turns. At the company, Eunsul becomes entangled with Jisun's cousin, Cha Muwon (played by Kim Jaejoong), a man of great abilities who wishes to take over his cousin' company by forming an alliance with both her and Seo Nayun (played by Wang Jihye), the company's competent attorney and an heiress in her own right. Aiding in Muwon's ambitions is his loyal and perfectionist secretary, Yang Hayoung (played by Lee Heewon) who happens to harbor feelings for her boss.