In this drama, it first shows a story of Lee Jin Pyo who started this revenge thing. He vows to avenge his fallen comrades (it shows in the first episode) and kidnaps the infant son of Moo Yul (you'll understand if you watch it). He then flees to the Golden Triangle to raise the boy and he trains the boy in combat and also treats him as his own child. After an attack on the village they were living in, Jin Pyo tells about his revenge plan to the child, who grown up is played by Lee Min Ho, called Lee Yoon Sung.
However, this drama was intense and hot. Especially the part where he helped save Kim Na Na from falling to her death by pulling her to safety even with a wound on his arm. This is a great drama because it guarantees thrill, suspense, and a cute love story that is a little complicated. The ending wasn't what most would expect of a romance drama however I felt like it fit for the story. Therefore, for those who haven't watched this yet, I recommend this. The chemistry was also great because at that time Lee Min Ho and Min Young started dating or something like that. But they broke up now.