The Demon Lord Beiming is wickedly charming and fiercely unruly, or so he likes to think. His favorite pastimes are ruling the demon realm and sampling new desserts, a closely guarded secret. The Immortal Lord Nanyuan is aloof and otherworldly. His life's work is maintaining order in the immortal realm and... putting labels on absolutely everything.
Just as these two sworn enemies, entangled for a thousand years, begin their Nth earth-shattering final showdown, ready to settle once and for all who is superior, the Heavenly Dao sends down a pink-and-gold pillar of light and a bizarre decree trimmed with lace!
The "Compulsory Coexistence of Natural Enemies Act" takes effect immediately! Reason: to maintain balance among the Three Realms. Terms: the Demon Lord and the Immortal Lord are forcibly bound to live under one roof, and may not go more than three hundred meters apart! Objective: complete embarrassing cooperation tasks every day to produce "harmony energy"! Penalties: a full service package including turning into a mushroom, losing one's magic powers, and having one's most humiliating dark secrets publicly exposed.
And so, the wonderfully bizarre "Harmony Lodge" springs up: an immortal-energy wing beside a demonic-energy wing, a heart-shaped bedroom, and a kitchen where fire and water refuse to mix. The icy Immortal Lord starts drafting "108 Rules for Living Together," while the irritable Demon Lord promptly burns the draft to ashes.
Their daily life becomes a series of events: a morning bathroom turf war! Forced mutual compliments, hellish edition! Knitting an ugly-as-sin heart-shaped scarf together! Stepping on each other's toes during a partner dance task! And socially mortifying moments when their subordinates come to visit!
Beiming: "Even if I perish, I will never accept this ridiculous act!"
Nanyuan: "According to Article Five, Chapter Three of the act, please put my towel back where it belongs first."