Double Star Defense

In one body, there live two sworn enemies: one is an alien spy lurking on the earth, responsible for assessing whether human civilization should be "pruned"; the other is a social animal reborn here, secretly passing information to the human police. They share senses, memories, and even heartbeats, and they have to fight over whether to eat rice noodles or nutritious ointments for breakfast. However, when an extraterrestrial civilization issued a final assessment notice, the fate of the earth actually depends on whether these enemies can prove in front of the interrogator that "contradictory symbiosis" itself is the most precious answer to civilization.