Xuan Yong's lord, Sikong Zhen, uses the power of thunder to guard his domain, but a surprise attack by the demon clan leaves the barrier on the verge of collapse. To protect his people, he has no choice but to seek help from the Storm Dragon King, ruler of the Storm Nest in the canyon. In exchange for the dragon king looking after his personal safety, Sikong Zhen borrows the power of the storm to reinforce the barrier. From then on, the two who once went their separate ways find their fates closely entwined.
The Storm Dragon King seems overbearing and aloof, yet he always protects Sikong Zhen in his own way. When the Shadow Legion launches a surprise attack, he crushes the enemy at once. When someone inside Xuan Yong tries to seize power and spread rumors, he secretly puts the turmoil to rest. And when the ancient beast “Hundun” breaks free and threatens the canyon, he fights shoulder to shoulder with Sikong Zhen. Even as his scales fall and his primal essence is depleted, he vows to keep Sikong Zhen safe.
At first, Sikong Zhen resists this “controlling kind of protection.” But as they weather one crisis after another together, he gradually learns about the Storm Dragon King's past as the last of his dragon clan. Having lost his people, the dragon king cherishes those he wants to protect all the more. When their powers of thunder and storm blend perfectly as they fight side by side, Sikong Zhen finally lets down his guard and forges a bond of mutual trust with the Storm Dragon King.
Later, the Storm Dragon King finds the dragon clan's secret treasure, the “Heartbond Pearl,” bringing new hope to them both. With the heroes of the canyon there to witness it, they welcome a child named Sifeng, who can control faint traces of thunder and storm. From then on, the lightning of Xuan Yong and the purple bolts of the Storm Nest shine together. The family of three protects the canyon and their homeland, writing a heartwarming tale of duty, protection, and a life spent together.
