At eighteen, Lu Zheng is still young, but he has already been through two breakups in a row. On top of that, his family is buried in debt. Disappointment in love and hardship in real life leave him physically and mentally exhausted. In the end, on Uncle Wu, one of his creditors' advice, he heads to Singapore to seek a way forward. Unexpectedly, while traveling there by ship, Lu Zheng gradually realizes that Singapore is not the ship's destination. So he leads a revolt aboard the vessel. But the revolt he leads is brutally crushed by a mercenary organization called the Blood Skull. Most of the people on board are killed by the mercenaries, and only a dozen or so, including Lu Zheng and Jin Xin, survive. Through a twist of fate, Lu Zheng and the others are forced to join the Blood Skull mercenary organization. After enduring hellish training, the two finally become full-fledged members of the Blood Skull. While carrying out an ordinary mission, they unexpectedly discover that the organization is secretly engaged in filthy dealings that sink beneath the limits of human decency. The kindhearted and righteous pair cannot stand by and do nothing. They endure a string of near-death battles and countless schemes, caught up in the push and pull of love and friendship, loyalty and betrayal. Accompanied by his teammates and childhood friend Jin Xin, Lu Zheng eventually transforms from a good-for-nothing boy into a top mercenary, completes his revenge, and returns to a peaceful life.
