Genghis Khans father, Yesugei, had just conquered a small area of Mongolia. On the day of the birth of his eldest son, Yesugei captured a man. He spares the life of that man and asked for his name. The mans name was Tit Mok Jun and so Yesugei named his son Tit Mok Jun. Eighteen years later, Tit Mok Jun and his younger brother, Hak Sai Yee, are out hunting for rabbits. Tit Mok Juns half brothers join in but treat Tit Mok Jun and Hak Sai Yee badly. They steal Hak Sai Yees rabbit and all the brothers engage in a fight. Tit Mok Jun breaks up the fight and leave. Later on, Tit Mok Juns half brother tries to kill Hak Sai Jun. Tit Mok Jun kills him with his bow and arrow but realizes too late his wrong doing. After that, Tit Mok Jun swore to protect all his brothers, including his half brothers.

Tit Mok Jun was of age to take over his clan because his fathers sworn brother acted as regent. Tit Mok Jun and his family are ordered to be killed. Tit Mok Jun gets captured but then gets saved by his friend Cheut Lo Wan. Tit Mok Jun, again, almost gets captured but is saved by Jak Mok Hup, one of the three great khans of Mongolia. They wrestle and became sworn brothers, andap. Tit Mok Jun took the head of an arrow and Jak Mok Hup kept the feathered end as a symbol of their friendship. Tit Mok Jun then marries Princess Foo Yee Tip, one of Jak Mok Hups love interest. He travels to find Wong Hau, his fathers sworn brother, to help him regain his throne but is rejected.

During the ordeal, Foo Yee Tip is captured by a tribe. Jak Mok Hup, Tit Mok Jun, and Wong Hau rescue Foo Yee Tip, who was raped. Tit Mok Jun moves to Jak Mok Hups kingdom but gains favor in the eyes of the peasants. Jak Mok Hup tries to rape Foo Yee Tip because of jealousy. Tit Mok Jun had to arm wrestle Jak Mok Hup to be released from his kingdom. Tit Mok Jun is considered a hero and many people follow him, including To Tai Wai and his uncles. With a massive army, Tit Mok Jun reclaims his land. Meanwhile, Jak Mok Hup considers Tit Mok Jun a threat and attacks him but is defeated. After this defeat, Jak Mok Hup turns to Song Quan, Wong Haus son, for help. Wong Hau turns on Tit Mok Jun but the assassination failed. Realizing he had been set up, Wong Hau returns home in shame.

Later, Tit Mok Jun kills Wong Hau. Jak Mok Hup tries to attack again but fails. Jak Mok Hup then challenges Tit Mok Jun to duel but loses. Tit Mok Jun decides to spare Jak Mok Hup's life because he had saved him. Jak Mok Hup refuses because with his death, Tit Mok Jun can become Seng Gus Si Hon or Genghis Khan.