In episode 6 of MBC's Friday-Saturday drama "21st Century Great Lady," Seong Hee-joo (IU) and Grand Prince Ian (Byun Woo-seok) present a surprise event to conclude the Naejinyeon.

This episode reveals a scene where the two protagonists become partners at a waltz party and dance to the music. Seong Hee-joo appears in a beautiful and elegant dress, while Grand Prince Ian is dressed in his uniform, showcasing a fairy-tale-like visual. Their perfect harmony on stage captivated the attention of everyone present.

Previously, Seong Hee-joo and Grand Prince Ian had an argument over whether to proceed with their contract marriage, but they came to understand each other's positions, encouraged one another, and restored their relationship. Determined to fight without backing down to get what they want, the two walked together at the Naejinyeon, which only invited guests could enter, hinting at their next move.

The second act of Naejinyeon, the waltz party, was attended by influential figures from politics and business, creating a romantic atmosphere between Seong Hee-joo and Grand Prince Ian. A scene where Grand Prince Ian kneels and offers a ring to Seong Hee-joo, asking, "Will you be my wife?" was revealed in the preview for episode 5, drawing attention.

Meanwhile, Prime Minister Min Jung-woo (No Sang-hyun) and Queen Dowager Yoon I-rang (Gong Seung-yeon), who opposed the couple's marriage, were seen watching them with stern expressions. Episode 6 will air on the 25th at 9:50 PM.