During the treacherous undercover work, an untimely encounter made the two people's fates tightly intertwined. The two depleted hearts were tightly dependent on each other, and they bit like wild beasts until they died. They have no past and no future, but they want to hold on to the last glimmer of light in this dark world. Who is the moth, who is the fire, and who is really trapped in this deadly game...
Purpose: Two people with very different identities go from testing each other to cherishing each other. They become dependent on each other in the dark underground organization, constantly seek the direction of justice, and wipe out the evil forces in one fell swoop.