The South Korean president and his delegates are visiting Burma (now Myanmar) when a bomb planted by North Korea explodes, killing some high ranking officials, in a historical event called the Rangoon bombing (also known as the Rangoon incident). To strike back, five South Korean officials plan an underground operation to enter North Korea and kill North Korean agents. Unbeknownst to the South Kor
ean president, Lee Jin-Pyo (Kim Sang Joong) and Park Moo-Yul (Park Sang Min) who work as bodyguards for the Blue House, organize a 21-men troop to execute the plan. However, as the operation was taking place, the five high-ranking officials change their minds, aborting the plan in order to avoid an international crisis if the mission were to be discovered. The major concern is that the United States will withdraw its nuclear protection if the mission is made public. The operation is successful, but as the troops swim to the submarine which is supposed to take them back to South Korea, snipers from the submarine shoot and kill all the troop members, excepting Lee Jin-Pyo, while they are still in the water. As the only survivor of the ambush, Jin-Pyo swims back to shore and returns to South Korea, where he finds out that there are a total of five officials responsible for aborting the operation. Vowing to avenge his fallen comrades, including his closest and best friend Park Moo Yul, he kidnaps Moo-Yul's son and flees to Southeast Asia's Golden Triangle, specifically the mountainous Burmese-Thai border. There, he raises the child as his own and trains the boy intensively in combat. Following an attack on the village, Jin-Pyo confesses to the child, Lee Yoon Sung (Lee Min Ho), about his long-term plan for revenge. Seven years later, after successfully finishing his college years in the United States at Massachusetts Institute of Technology, Yoon-Sung returns to South Korea to fulfill his step-father's plan for revenge. He enters the Blue House (South Korean presidential palace) as an IT expert under the National Communication Network Team. He is warned by Jin-Pyo not to trust anyone and not to fall in love, as doing so will put the people around him in danger. At the Blue House, he meets bodyguard Kim Na-na (Park Min Young). The story of love and revenge begins.
