Singer and actor IU will play the role of Seong Hee-joo, CEO of Castle Beauty, in MBC's new Friday-Saturday drama "21st Century Great Lady." This drama is set in a 21st-century constitutional monarchy Korea and depicts the romance between a woman who has everything as a chaebol but struggles due to her commoner status, and a man who is the king's son but has nothing.

Seong Hee-joo, portrayed by IU, was born as an illegitimate child of the Castle Group. She is a chaebol with glamorous looks, exceptional intelligence, a strong competitive spirit, and business skills that earned her the Best Entrepreneur Award. However, Seong Hee-joo has a weakness due to her commoner status, which affects her social standing in constitutional monarchy Korea.

To overcome her limitations, Seong Hee-joo sets a goal to enter into a contract marriage with Prince Ian (played by Byun Woo-seok). She is devising various strategies to advance beyond success in the business world and into the royal family. Her character is emphasized as a born competitor who spares no means or methods to achieve her goals.

In the released photos, Seong Hee-joo is seen passionately leading a meeting with executives in a conference room. Her gaze exudes the charisma of a company owner. Additionally, her presence at an event receiving the spotlight from reporters was captured. She stands out with striking fashion, drawing attention as the CEO of Castle Beauty.

The drama "21st Century Great Lady" will premiere this April. Interest is growing in how IU's character Seong Hee-joo, her complex social status, and her relationship with the royal family will unfold. This drama addresses issues of social status and personal ambition in modern society, promising an engaging story for viewers.