Beneath Yanyu Harbor lie seven palaces, each home to mermaids of a different color. Together, they protect that beautiful harbor.
Lan Ji is one of the mermaids who lives there. One day, she used her own blue scales to forge a sword and wound Yu Yang Jinran, the man she had loved for three hundred years, shattering the peace between their two families. From that day on, Yu Yang Jinran lost all his memories of Lan Ji. Can their tragic love story continue?
Meanwhile, a dark figure often appears by Lan Ji's side, seeming to manipulate her and hold sway over all three realms. Arrogant, domineering, and disdainful of everything, he nevertheless keeps breaking his own rules for Lan Ji.
The Yecha Tribe, which vanished five hundred years ago, has suddenly returned, striking fear into everyone's hearts. The various factions are secretly gathering their forces to prepare for the next great war. Lan Ji, too, wants to stop it from happening.
Amid tangled love and hatred, under the shadow of a world in chaos, Lan Ji's romance is like a little boat rocking in a raging storm, quietly sailing toward an unknown destination.
What upheaval will the return of the Yecha Demon Clan bring to Lan Ji's fate and to the centuries of peace? The answers lie hidden in the unknown mists, waiting for her to uncover them.
Theme: The clash between personal heartbreak and responsibility in a turbulent age
