While working at the Blue House, Lee meets bodyguard Kim Na-na ( Park Min-young). Jin-Pyo warns him not to trust anyone and never fall in love, as doing so will put the people around him in danger. He enters the Blue House as an IT expert under the National Communication Network Team. Seven years later, after successfully finishing his education and attaining a doctorate in the United States at the Massachusetts Institute of Technology, Yoon-sung returns to South Korea to fulfil his adoptive father's plan for revenge. Following an attack on a village they live in, Jin-Pyo confesses his long-term plan for revenge to a teenaged Yoon-sung.

He flees to the Golden Triangle to raise the child as his own and trains the boy intensively in combat. Promising to avenge his fallen comrades, Jin-Pyo kidnaps Mu-yeol's infant son and names him Lee Yoon-sung ( Lee Min-ho).

Lee swims back to shore and returns to South Korea, where he finds out that the assault team's service and personal records have been erased. An already injured Park sacrifices his life to save Lee. The operation is successful, but as the troops swim out from Nampo to an ROK Navy submarine assigned for their extraction, snipers aboard the submarine open fire on them. In light of Seoul's official declaration, it will not retaliate. Their major concern is that the United States will withdraw its nuclear protection if the mission is made public. However, as the team wreaks havoc in Pyongyang, the five officials, by a majority decision of 4 to 1, abort the plan to avoid an international crisis if the mission is discovered. Lee Jin-Pyo ( Kim Sang-joong) and Park Moo-yeol ( Park Sang-min), two Presidential Security Service bodyguards and best friends who were present at the bombing, organize a 21-man team for the mission. To strike back, five South Korean officials plan a covert operation, codenamed 'Operation Cleansweep', to enter North Korea and kill several top members of the North's high command. This historical event is called the Rangoon bombing (also known as the Rangoon incident). In 1983, the South Korean President Chun Doo-hwan and his delegates are visiting Burma when a bomb planted by North Korean agents explodes, killing some high-ranking officials.

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