Set in the constitutional monarchy in an imaginary South Korea, South Korea's Crown Prince Lee Jae Ha is forced to join the World Officers Competition, WOC, by his brother. There, he meets North Korea's strongest female devil instructor Kim Hang Ah.
The world's attention is focused on the forthcoming World Officers Competition, WOC. North and South Korea decide to work together to send a unified team to participate in the competition. North Korea send their elite Special Forces instructor, Kim Hang Ah.The South Korean Prince Lee Jae Ha who is scheduled to be discharged from military service is hesitant to leave the court to be an ordinary citizen, after receiving the request by the royal commission's decision for him to participate in the General Assembly. There, the North-South confrontation officers have been gathered, Hang Ah is running towards Jae Ha...
Jae Ha who is insulted by Hang Ah finally joins the training after being threatened. He and Hang Ah are assigned to the same dormitory. At the same time, there are rumours flying around that Kim Bong Goo personally kills his father and inherits his father's military Empire, Club M.
The scar at the bottom of Hang Ah's heart is made in to a public joke by Jae Ha. However, Hang Ah's tears causes Jae Ha to feel guilty and dejected too. They decide to determine the winner on a treadmill in a war of words. But Club M places a bomb on the treadmill, which endangeres their lives...
With North Korea on the training ground, the mischievous Jae Ha stirres up more trouble and ignites the wrath of Rhee Kang Seok, who want to kill Jae Ha in rage, causing both North-South Korea members pointing guns at each other. The North-South Unified Team is in crisis again...
Jae Ha decides to openly declare his love for Hang Ah. Hang Ah knows that Jae Ha is lying. To teach Jae Ha a lesson, she decides to go to South Korea to participate in a matchmaking date. On the other hand, Jae Ha who schemes to make Hang Ah fall in love with him and then dump her, carefully arranges the venue.
Hang Ah rejects Jae Ha's confession but she still cares about Jae Ha's whereabouts. Jae Ha confesses to Hang Ah that it is all a pretense. Hang Ah is heartbroken. It is supposed to be published that he frankly rejects Hang Ah and has not planned to speak. But she announces in retaliation that she falls in love Jae Ha and is willing to be engaged to him.
Jae Ha and Hang Ah announce their engagement news, causing both North-South to erupt in joy. Hang Ah from the North will be marrying into the South. As she begins to embrace her new life, the Dowager is not at all satisfied with her. King and Queen are assassinated and Princess Jae Shin is caught by the killer and forced to jump...
Jae Ha returns to the palace to make arrangements for his brother's funeral, and formally ascends the throne. Hang Ah appeases her father and wants to stay in the South to help Jae Ha. The Secretary-General informes the King about Eun Gyu Tae's strange death, and that he receives Bong Goo's text message and understand that their own mistakes had led to the death of the King and Queen. Jae Shin regainedconsciousness in the hospital, but has lost her memory. It is also then that they learned that she has become paralyzed.
"Hang Ah who wants to participate in public hearings felt nervous, but Eun Gyu Tae lies that Hang Ah is insincere and forces Hang Ah to stand at the hearing site. The innocent Hang Ah who is accused and attacked at the hearing could only accept those lies. Jae Ha who sees it all on TV is filled with anger and immediately orders the King's death to be clarified that it is not related to North Korea... "
Jae Ha tells Gyu Tae and the secretaries that Hang Ah will be returning to North Korea. Eun Shi Kyung and Jae Shin are shocked with this sudden decision. In the palace, Jae Shin is told by Hang Ah that she will be coming back, but Hang Ah's departure makes Jae Ha regret his actions. When Hang Ah's father comes to pick her up to return to North Korea, they decides to start life anew, but she suffers from a miscarriage...
Hang Ah's father discovers that his daughter suffers a miscarriage. He receives news of Gyu Tae claiming the royal position in this matter and do not bother to give any explanation. He even persuades Jae Ha to just leave Hang Ah, so as the royal family could rid themselves of the scandal. On the other hand, the North Korea commander requests to Hang Ah toexpose Jae Ha, but is cleverly rejected by Hang Ah.
When Lee Sang Yeol sends a sniper to assassinate Jae Ha, Kim Nam Il immediately reports about the mysterious Myung Ho, but he accidentally learns that Myung Ho's action programmes have already alerted the Sang Yeol. Hang Ah asks her father to immediately escort Jae Ha back because of the big battle upfront.
Jae Ha says he will continue to attend the WOC. Should the game fails to cancel the North-South alliance, against all the odds, Jae Ha makes arrangements for Princess Jae Shin to conduct provisional duties on behalf of the King. Hang Ah has also taken to her responsibility to protect the princess. She goes to the hospital and tries to convince the princess to accept her.
Bong Goo replaces the music of the royal welcome dinner, which co-incidentally, is Jae Shin's trauma trigger. Bong Goo panicks and drops the letter in his haste to escape. Eun Shi Kyung begin investigating Bong Goo and the woman killer, while Gyu Tae tries to hinder him...
At the competition venue, Hang Ah kidnaps the American hostages and threatened the American team leader to surrender, while Jae Ha successfully breaks into the US command post. Hang Ah capitulates to no avail before they detonates the bomb which Jae Ha has installed in the United States team.
Gyu Tae receives Club M's call during the ceremony and they demand Jae Ha to step down from his position, Gyu Tae refuse. Jae Ha questiones Gyu Tae after receiving Club M's call but Gyu Tae requestes him to cancel daily schedule due to safety reasons. Jae Ha do not heed Gyu Tae's advice and sends him away.
Hang Ah manages to convince Jae Ha about the abdication in a video conversation. Bong Goo threatens Hang Ah and forces her to act pitiful to melt Jae Ha's heart. In the video conversation, Jae Ha expresses his willingness to abdicate. Hang Ah pretends to be pitiful in front of Jae Ha and actually implies about the hijacking and hijacking locations.
Hang Ah flies to a farmhouse and is reported by the man of the house. Bong Goo retaliates and Hang Ah is defined as a defector and is detained. Because of some twists and turns, Jae Ha finally discoveres some facts of sanctions about Bong Goo's international legislation, and publicly announces the fact that the former King is murdered.
Shi Kyung and Jae Ha communicates with each other. Jae Ha successfully decipheres a clue and discovered Bong Goo's scheme that leads to his arrest. Shi Kyung and Jae Ha infiltrates into Bong Goo's group. Jae Ha is discovered and forced to sit opposite Bong Goo. His life is at the mercy of Bong Goo. The safety of the Republic of Korea is threatened and a withdrawal is proposed. Jae Ha abdicates, and Hang Ah is forced to break up with him...
The Prime Minister informs Yeom Dong Ha that Jae Ha is about to attack North Korea.Initially, Jae Ha's first thought is to leave Hang Ah. Hang Ah's father goes to war, and his daughter may be taken away without having a chance to bid him a last farewell. Jae Ha hopes to return to pick Hang Ah up. But Hang Ah decides to return to the North to try to stop the war. And the two love-birds burst into tears of sadness...
