Both Jae-ha and Hang-ah meet at the joint military training, a crucial part in establishing friendly relations between the two separate countries.

While they attempt to set their differences aside and build a growing relationship, things suddenly take a turn for the worse when King Jae-kang and his wife are assassinated by the devious and notorious terrorist group, Club M, led by John Mayer/Kim Bong-gu (Yoon Je-moon), a mysterious magician who is obsessed with eliminating the royal family and plans to rule in their stead.

The female protagonist - A North Korean Special Forces officer and instructor known in the military to be an "Iron Lady" with absolutely no femininity within her.

After a few incidents involving her and the South Korean prince ("the archenemy of the socialist state and the people"), Jae-ha falls in love with her during the training mission.

Unknown to many, Jae-ha's arrogance and behavior was a front so that he could avoid having to meet and befriend people - he had difficulty finding "real friends" in school once his royal status became known.

As a means to whip him into shape, North Korean Representative and Captain Kim Hang-ah "threatens" him into submission right after their first encounter.

The son of the king's chief adviser Eun Kyu-tae, he is a South Korean military officer who participates in the joint collaboration.

Later promoted to the Royal Guard, he is absolutely loyal and strict by nature, initially detested by Prince Jae-ha due to his "old-fashioned"-ness resembling King Jae-kang.

He decides to assassinate the South Korean king after peace talks are established between both sides of 38th Parallel which compromised the interest of his weapons business.

She has a somewhat naughty sense of humor, which once got her arrested by Eun Shi-kyung (not knowing her true identity) when she dressed down and made fun of her royal self.

Jae-ha's and Jae-shin's oldest brother is the King of South Korea, a caring and responsible man to both the Royal Family and the rest of the country.

The palace chief adviser who plays a key role in the scheme plotted against the South Korean royalty by John Meyer.

Though he publicly denounces South Korean pop groups like Girls Generation, he secretly admires their music and get outraged when someone discover this side of his character.