The story begins when Han Fei, the top scorer in the college entrance examination, breaks into the restricted area of an abandoned gate on the Qiantang River late at night to investigate the mysterious disappearance of his father Han Weiguo. He was immediately chased by military drones, and at the critical moment of life and death, he accidentally used his own blood and his father's relic (a tidal totem notebook) to activate the secret facility hidden under the gate - the "Leyline Tidal Core".
Through the images left by his father, Han Fei learned that his family was the guardian of this core for generations. This facility can control the tidal power of the Qiantang River and even the East China Sea, and is the lifeblood of the country. The disappearance of his father was not an accident, but was caused by the "Hilong Group" who attempted to seize the core.
Immediately afterwards, the armed personnel of the Hilong Group attacked the core. Forced into a desperate situation, Han Fei used his instinct to activate the core power for the first time, summoning a devastating "line of tide" out of thin air, annihilating the enemy in an instant. However, the Hilong Group quickly launched a public opinion war and smeared him as the terrorist who detonated the gate, putting him in a desperate situation where he was considered an enemy of the whole people.
Faced with the double dragnet of technology and public opinion, Han Fei did not sink. He learned from his father's last words that power lies not only in manipulation but also in union. He used his core to sense two potential forces attracted by the tidal changes: the Cao'e River Boat Gang, which represents the human water intelligence network, and the mysterious sharks, who represent the ancient underwater civilization. He took the initiative to release signals of goodwill and successfully established an initial positive connection with the two, laying the groundwork for establishing his own power.
