In this world, countless lives go on beneath the warmth of everyday life. Yet there are always people who sacrifice themselves to stand guard through the night, shielding everyone from the filth.
The Lu family has served with unwavering loyalty for generations, their navy-blue uniforms carrying on the legacy from one generation to the next.
As fate closes in around her, Lu Qinghe sheds the gentleness of her youth and takes up the unfinished mission of her father and brothers, plunging alone into the boundless abyss. She hides her identity and abandons every trace of a peaceful life, walking as an ordinary person through the darkest, most treacherous of hellscapes.
Shen Yan is a blade buried in the deepest heart of a den of vipers, a quiet guardian keeping watch through wind and rain.
Fate brings them together again at the bottom of a murky abyss, making them the most perfectly attuned partners in life and death on a covert front.
Two years undercover, adrift amid shifting tides, strangers despite their closeness, locked in a struggle between light and shadow.
In public, they are distant and indifferent, mere strangers to each other.
In private, they entrust each other with their lives, and let their hidden feelings quietly take root.
The abyss tempers their bones; their blades carry their love.
They hide their heartbeats behind cold stares and seal their love away amid life and death.
Dressed in navy blue, enduring in silence for half a lifetime, with the lights of countless homes before them, their own love is the least important thing.
Everyone hopes for dawn to break.
But there are always some who carry the light,
step into the long night,
and never see daylight again.
Theme: Enter the long night with flesh and blood, set aside the bonds of personal love, and preserve the ordinary warmth of life for all.
