Jung Tae works hard to make money for his sister's surgery. Jung Tae's friend, Jjang Ddol, hears that they can get big amounts of money by investing in smuggling, by the help of a man named Poong Cha. Later, they discover that they were conned and the money was stolen. Jung Tae goes to get revenge from Poong Cha who is in Do Bi Gang after his money was stolen.

After the fight with Poong Cha, they discover that someone was using Poong Cha's name to con Jung Tae. Poong Cha then ask them to join Do Bi Gang and work for him work. Later, Jung Tae's sister collapse and was saved by Jung Tae's father. Jung Tae in need of money, goes to jump from 30 meters bridge at Yalu River to joint the Do Bi Nori (Train jumpers).

Jung Tae jumps from the bridge but survives and joins Do Bi Nori (Train jumpers), but is not allowed to jump trains until he finishes training. Gaya kisses Jung Tae causing Ok Ryeon to feel jealous. Aka an assassin kills Gaya's father, but Gaya misunderstands and thinks Jung Tae's father killed him. She vows to kill Jung Tae and his father.

Jung Tae successfully jumps on a train, but when he arrives in China to deliver the things, he is betrayed and stabbed. Meanwhile, Jung Tae's sister kills herself by jumping from a cliff. Gaya trains in Japan, and had a test with Aka and succeeds from the first hit.