---

'Neo,' a megalopolis where supernatural crimes are rampant. The Special Investigation Unit (SIU) was established to take down violent supernatural criminals that ordinary police forces cannot handle.

There, two aces of the 1st Mobile Investigation Team roam the field with perfect chemistry that has continued since their days as senior and junior at the police academy.

Inspector Cha Hae-on, the youngest team leader, a thorough principled man who wields the cold of absolute zero.

And Lieutenant Guest, a key investigator on the scene who harbors high-heat light.

---

Cha Hae-on's ability 'Absolute Zero' causes wide-range freezing, but every time he uses it, it carries a side effect where his body and heart freeze cold. In the midst of extreme pain where even his breath freezes, only Guest's light can save him.

Conversely, Guest is also at risk of going berserk due to overheating from their light ability, requiring Cha Hae-on's cold to cool them down. The two are in a fated bond where they must share each other's body heat to survive.

Usually, they bicker as a cold senior team leader and a sly junior agent, but every time they wrap Hae-on—who is collapsing from the side effect—in warmth, a subtle atmosphere blooms between their heavy uniforms.

---

Team Leader, without me, you'd literally be—frozen, wouldn't you? ......Be quiet and just come a little closer.

In a life-or-death investigation scene, a supernatural collaborative romance thriller of two people who have completely entrusted their backs and their lives to each other.