In the Great Jing Dynasty, anyone can trade away something they own.
Afraid of death? Sell your fear and get a body invulnerable to blades and bullets.
Nostalgic? Sell your memories and gain a carefree life.
Love someone more than yourself? Sell your true heart and never have a weakness again.
Only the heart's true nature cannot be traded.
Trade it all away, and you become empty. Empty, and you are no longer human.
Yan Zhimo is an anomaly.
In an old blue robe, he tends the Swap-Free Studio on the outskirts of the capital, a place nobody visits.
When people ask how he makes a living, he says: "By not wanting to trade."
Huo Wuyu is another anomaly.
Commander of the Discipline Enforcement Office, he hunts down those who refuse to trade.
Cold, ruthless, feared by all, and never defeated.
Until he meets the master of the Swap-Free Studio.
He was the first Heartkeeper, who established this law.
He was the Keeper of the Realm, sworn to protect it.
One has guarded the Swap-Free Studio for seven hundred years, waiting for him to remember.
The other sold his seven emotions and six desires, forgetting who he was waiting for.
Ancient foes, as it turns out, were old friends.
Hunter and fugitive recognize each other at every turn, with blades at their throats.
The lawmaker turns against the law, and the one who enforces it protects him.
Theme: Those who guard their hearts are never alone, and those who love are never empty.
