They were taking cover behind huge trees, looking at a huge block-like building, surrounded by forest and mountains. For sure the building was too just taken over by the enemy.

"That's huge! How you can ensure that we don't end up getting lost in it?" asks Yoon.

"Because this is my ground. I play here for quite a long time.." says Sun. His head pokes out, looking for the empty spot so they can sneak in.

"Where are we now actually?"

"Mountain Peek. A paradise for a weapon enthusiast like me.." says Sun, smirking. 

"To be honest, I thought I already finished roaming around Cosmos City, yet I still know nothing about it!" says Justin.

"I feel ya. But, who wanna visit a place that makes weapons?" asks Cygnus. True indeed. This place is not a park or playground. Maybe, for someone like Sun who is in this business. But not a civilian like them.

"I never come here, even though Jein used to work here," says Joon.

"Like I said before, who wants to come here?" asks Cygnus.

"Guys, shush and focus. I think I saw an entrance. We can squeeze in. Remember our formation okay. Don't split and end up dead," says Sun. He grabs a pistol from his back pocket.

"Please stop mentioning dying during a mission. That's not motivational at all.." says Yoon, holding a revolver in his hand. He looks at Byul, who leaning closed at him with her gun in her hand.

"Take this, mister. You will need this later.." Sun hands out a good revolver to Joon. He almost drops it when he holds it for the first time.

"My God, I hate this so much!"

"You are having a relationship and living together with a weapon specialist and gun creator, and yet hates guns so much?" asks Yoon.

"What? You and Jein are a couple?" asks Sun.

"We confess.. wait, he confesses but we didn't make anything official yet," Joon blushes all over.

Sun notices another gun set at Joon's waist.

"Wait, you have a gun but you didn't use it?" asks Sun.

"This belongs to Jein. I took it along with me, just in case. He kept this in a special container, which I don't know why.." says Joon, taking it out from his waist belt and handing it to Sun.

"Eh? If I'm not mistaken, this is Pakuka. He always brings this around, but I only saw him use it once. It was a storm and thunder during that day.." says Sun. 

He still remembers that day like it was yesterday. That day was the last day Jein took part in a field mission for Black Wolf collaboration with Mountain Peek. And he retired after that.

"Eh, why?" asks Justin.

"The bullet was made by a special mixture of metal which only activates by lightning voltage. But the way of using it is quite barbaric, which of course explained why Jein only used it once.." suddenly everyone is paying attention to the gun.

"How? Why?"

"You need to get struck by thunder to activate it.."

"Hah? Yargh, who wants to end up roasted in the middle of a field?!" Justin cringed.

"So, you said that Jein got himself struck by a thunder when he used it?" asks Yoon.

"Nope, it was an accident. He dropped it during a fight and suddenly it got struck and activated. When Jein saw this, he took the chance and used it for the first time.." says Sun.

"Wow, that's so Jein.." said Joon.

"What a silly way to use a gun! I mean why did he create the gun that is hard to use?" asks Yoon.

"That's a Jein Act.." and, Joon confirmed it again.

"If I told you this, promise me you won't tell him.." Sun sighs. He tries not to laugh in the middle of a conversation.

"Okay.. what is it?"

"He creates this due to boredom.."

"What?!"

"Okay.. that's Jein.."

"Stop describing him, Joon. We know he is JEIN!" Yoon smacks his shoulder hard.

"He was bored one day and there's a scrap of metals that we use to make bullets in a box. We plan to discard it the next week. So, he was just playing around when suddenly he realized that he create something odd. But he soon realizes that something was off. The gun can't be used. Because it is an automatic gun, somehow it needs to be triggered by something like you know smartphone that needs to be charged using the electric charger. That's how it works.."

"He was making a lot of experiments until one day he found out the element that can activate the gun is thunder. Since then, this gun was called a failure creation. But Jein never loses hope in this. That is why there's only one pakuka in this world. Only for Jein," says Sun. Joon studies the gun. So, this is the failure product made by a weapon genius named Jein. 

Well, this proved that even a genius too can make a mistake.

"Never mind, I'll just keep it.." Joon slips the gun back to his waist.

They snap each other's gun twice at the trigger, changing the mode into silence.

"Okay, follow the plan accordingly. Me, Cygnus, and Justin will raid the lower level, looking for the Thunder Storm. Joon, Yoon, and Byul will go straight to the second level for bullet stocks and manual. We will meet at the first level, the back door. Activate your communication device now," they click the activation button.

"Let's raid this building!"

***

Jein holds his breath. He takes cover behind walls. He manages to escape from the room, bringing along every single piece of equipment with him in a backpack. How did he manage to get one? Well, he manages to get into the locker room before he runs away. This is easy, like taking candy from a baby. This is his playground. He can go anywhere, the map is in his brain.

He takes a look around him. How will he blend in? He pause a bit and take some time to think. Then, an alien that looks like a human passes by the row. He takes a good aim and shoot him from his spot. The alien dies immediately.

Okay, this is useable.

He drags the alien behind the wall, take off his uniform, and get changed.

***

Cygnus gives a signal towards Justin and Sun. No one is around. What about CCTV? Joon had just hijacked it when they first enter the building.

They swiftly enter the hanger, pass by a huge quint jet parked in the middle of it. Justin watches the quint jet with awe. It's two times larger than his Pegasus.

Cygnus grabs his wrist when he saw that boy lost a moment there. They run towards the exit heading to the weapon storage room.

"Opss..." they quickly to cover behind the wall when they see a troop of aliens waiting outside the storage room.

"What now?" asks Justin. Sun exchanges glares with Cygnus. The boy nod and slowly approaches the troop. He sneakily attacks them with his swift move. They are all taken down in no time.

"Huh, what's going on?" asks Justin. He almost lost sight of Cygnus. He moves so fast even the enemy lost his track.

Cygnus gave a signal that indicates the ground is safe. Sun and Justin walk towards him.

"Welcome to my treasure box!" said Sun, grins widely.

***

Joon, Yoon, and Byul take cover behind the wall, looking for any opportunity to pass by the control room. Joon, who standing next to Yoon feeling nervous as this is the first time he held a gun in his hand.

Byul aims at the target. She pulls the trigger, finishes it in a one-off. Then she locks another target. But before she could even kill them, they just fall like a toy that lost power.

"What?" she confuses as she looks around, trying to find anyone that might hide in that area. No one insight.

She instructs a signal to Yoon and Joon. They move out from the hiding place when Joon suddenly drops his gun, making them flinch and jump around.

A figure shows up and points them a gun. They immediately put their hands up, standing still without moving.

"What now?" Yoon whispered at Byul. The figure takes off the headcover. He looked shocks as well as them too...

"Guys?"