Retrospect

Let's start from the beginning.

The first clue was provided by the earpiece, which is the fact that the spy is from the Clubs community, the community that's driven by greed, uses whatever means necessary to snatch resources from others for survival.

The most important resource of all, food is their main objective, if there was to be a spy within Diamonds territory, it's objective infiltrating is to steal our food supply for themselves.

From my exploration, I've confirmed that Diamonds territory is completely bordered by a 4 meter tall wire mesh fence, with no signs of damage.

If the spy were to smuggle food through the gates without damaging it, it'd be inconvenient and attracts attention.

The risk to be caught during the transfer is very high since one is bound to make a sound climbing the fences or throwing the supplies over it.

Scenario number 2, the spy delivers food to Clubs members through the gate, doesn't seem very probable either.

Being the only entrance, the gate is guarded 24 hours a day, it's even less likely that this is the route the spy take to transfer stolen food.

Which leaves one method, the method I would've gone for, it attracts the least attention, can be done at least once everyday, and movement is almost inconspicuous, which is during expeditions.

When Clubs ambushes, the battlefield is chaotic, soldiers with adrenaline pumping in their veins will pay less attention on the whereabouts of their own comrades, and more on their own survival during the gunfights.

During the gunfights, the spy can make contact with the Clubs soldier and deliver the goods.

Of course, this doesn't dismiss the other two possibilities, but it's certainly the most probable in my mind, which is why I volunteered during the expedition, to test out this theory, that the transfer of goods can happen during expeditions.

Even without the ambushes, expeditions are still the best place for the spy to transfer stolen food to Clubs, considering how the crowd is dispersed.

The main reason Clubs provokes a fight with Diamonds is to give the spy a convincing pretext to approach them and eventually make contact.

This is the only way to justify the ambush attacks of Clubs that from the surface, looks like it's in vain, while in reality, they did obtain food from these fights, just not from our casualties, but from the spy.

With that in mind, four ambushes, all four times the spy must've made contact, so in all four times the spy must've volunteered.

I also have a good reason to believe the spy only infiltrated very recently, otherwise the depletion of food for Diamonds will be apparent enough for someone to take notice.

For my entire stay in this world, no one has mentioned a thing about a spy infiltrating despite it being a serious matter, that means no one omitting myself was aware of a spy present among us yet.

This is a wild assumption from me, but it was soon confirmed. I believed the spy infiltrated during their first ambush, the ambush on Nine's team during Nine's expedition, which justifies all ambushes after it.

The spy has been planted and the rest of the ambushes are to facilitate the transfer of good from the spy to Clubs. But the spy isn't Nine.

Us, the officers who holds poker cards seems to have a friendly relationship with each other, replacing us is impossible unless one can mimic faces and personalities flawlessly.

Instead, it's more likely the spy threatened Nine's life and have him cooperate.

This is a assumption made by me when Nine chose melee weapons for the expedition, it's simply irrational, it doesn't depend on one's preference. I think he's intentionally weakening himself, or more accurately, forced to leave himself vulnerable.

If he had chosen a ranged weapon, an actual firearm, the spy loses his intimidation as Nine can now fight back easily, but if Nine never has any ranged weapon while the spy threatens him with one, there's no effective countermeasures that can be taken by Nine, so the spy has definitely inhibited Nine from arming himself with an actual gun.

This is assuming Nine is selfish, doesn't fight for the cause but fears for his own life, it might not seem like something he would do considering his line "The ambushes took my life, I will not allow it to take Two's." But the thing is, no one ever asked him why he volunteered, yet he felt the need to justify his presence.

Typical mistake made by a liar, giving the excuse far too early.

During the expedition, Nine went off with his subordinate away from me, Four and my subordinate. The direction they went? The direction of the attack.

This wild assumption needed proof, so I came up with an excuse to borrow Nine's dufflebag, which seemed partially filled during the start of the search, yet empty by the end of it.

While I was loading goods from my subordinate into Nine's dufflebag, I was actually inspecting it. I also intentionally left my own dufflebag behind in the battlefield to have a credible excuse to borrow his dufflebag. Inside? Bread crumbs.

My subordinate raided a bakery, obtained sugar and honey, these two foods don't ever spoil with time's passing, but bread does, which is why he didn't find any of it. It's fair to assume, both from the deteriorated conditions of the buildings and the only food remaining in the bakery, that no fresh bread will last just sitting around in a random building.

In other words, the bread crumbs inside Nine's dufflebag isn't something he found during his search, they were still fresh.

The only way I know to obtain fresh bread in this world is through the man in the maroon blazer, these bread are Diamonds property.

Could this just be food he brought on the expedition for himself?

No it can't be, there's a separate paper bag for that, and the portion brought by everyone is tiny, it wouldn't leave this large amount of bread crumbs.

His dufflebag seemed partially filled during the start of the expedition because it was holding bread he stole from his own group, from the boxes the man in the maroon blazer gave us.

Last proof I needed to confirm my theory was the fact that Nine volunteered every single time since he got ambushed.

Nine's subordinate, infiltrated during the first ever ambush by Clubs, threatened Nine's life with a gun, have Nine steal food and bring it during expeditions to be delivered to Clubs attackers.

It can only be him, Nine was with no one else during the expedition, only him.

Hence, Nine's subordinate is the spy who's started stealing food from Diamonds very recently, thus not noticed, he inhibited Nine from arming himself, thus can never be opposed, he has Nine bring a part of the bread supplied to his group on expedition, and deliver it to Clubs, thus achieving the objective of Clubs community, food.

When he said he's out of bullet during the fight, he was still holding his gun firmly instead of setting it down, he is most definitely not out, but needed the bullets to maintain his threat to Nine.

Of course, there's still mysteries left unsolved in this world, such as the apocalypse itself, the laboratory, how fresh bread is stored for such a long time in the Diamonds territory without spoiling.

But they're irrelevant, all that matters right now, is for the earpiece to give me my pass back into life. I got it right, I have no doubt, return me to life, mysterious earpiece.

"Congratulations, you have found the spy from Clubs community. Teleporting you to game lobby..."

Game...lobby?