It's the year 4195. But, it isn't what you'd think it'd be. It's a time filled with war, guns, destruction, ugliness, and, most of all, death. Ever since 4191, there have been alien invasions on Earth. An elite team, named EXO, has managed to deafeat all of them.

Or so they thought.

Right when they had fought off what had seemed to be the mother alien, the real deal came out. And now, someone has to go kill it.

From the inside, and never come out.

After a bit less than half of EXO has been killed already, one member sets out to do the job: Kim Jongin.

But, how would his lover, Do Kyungsoo, the man that Jongin is doing this for, react?