A few days prior:

"Y/n, we need to tell you something"

I looked at my parents, awaiting for what they had to say.

"What is it, dad. And... why is Gyeong-su here?"

"Well, we wanted to tell you, that...Gyeong-su's parents are very sick"

"Oh... I'm very sorry, Gyeong-su..." I said, turning to look at him.

"That wasn't the most important thing. You see....we adopted you 15 years ago and just found out that..."

"Gyeong-su here is your biological brother."

My jaw slacked as I stared at them and then at Gyeong-su.

"Wha-" I started.

"Wait, that's not all. Since his own adoptive parents are this sick, they've asked us to take Gyeong-su in after the big exam week." Dad said.

Gyeong-su was smiling nervously at me, waiting for my response.

"You're going to move in..? You're my brother?!"

I felt intense happiness fill my body as I jumped to hug him.

I had always wanted a sibling.

And someone like Gyeong-su would be the best option for a brother.

I mean, he had always already acted like a brother to me.

Gyeong-su hugged me back as my parents came to hug us as well...

~~~

As Gyeong-su pleaded for the others to believe him, I held his shoulders, looking at his scared face.

My mouth was opened halfway as I didn't know what to say to him.

He looked at me, close to letting tears fall.

"Y/n" He cried.

I hugged him tightly, tears forming in my eyes as he hugged me back.

"GET AWAY FROM HIM!" Everyone yelled at me, but I couldn't.

"What do I do, N/n?" Tears started rolling down his cheeks.

"This doesn't make any sense, I..." I hugged him tighter.

"How can this be so suddenly?"

Cheong-san stepped towards us, trying to pull me back, his own heart breaking.

"NO!" I yelled at him as I started sobbing.

Gyeong-su suddenly pushed me away.

"Don't come closer! I'm going to turn"

"S-shut up"

As he started twitching, I went back to holding him.

"Y-Y/n" He stuttered.

"It's going to be okay...I..." 

Su-hyeok quietly called out to me, telling me to come to him for my own safety.

"We need to throw him out! We're all gonna die!" Na-yeon screamed.

"What's happening?" Gyeong-su stuttered as he looked around.

"GET OUT!" Na-yeon screeched.

"SHUT UP!" I screamed while choking on my tears.

"No, I'll leave by myself! I'll go out on my own...."

"...Why would I bite you, we're supposed to be friends...?"

Gyeong-su's voice cracked.

"He's gonna kill us all!"

"Na-yeon!" Miss Park yelled.

"I'm just trying to stay alive"

"I'll leave" Gyeong-su announced.

"Please, N/n, help me out by letting go of me"

He then softly pried my hands off of him as he let go of me and staggered towards the door.

"G-gyeong-su, n-no" I stuttered, my heart breaking.

He got to the door.

"Thank you for everything...."

He only whispered the rest, so I was the only one who could hear what he was saying:

"And...Y/n, I wish I could've been a real brother to you...."

"I wish we could have movie nights, go on vacation...just be real siblings..."

No...he can't be...how?

My hands were shaking as I tried stopping him.

"Gyeong-su, b-but I need you..."

He turned to the door, his eyes glistening with tears.

Just before he was going to exit, he turned around to look at us one last time.

His sad face quickly turned into one full of fear as he stood there, petrified as his eyes scanned the room.

"Stop it! You're scaring me!" He suddenly yelled, looking around frantically.

"Cheong-san why are you doing this?"

He fell to the floor as his bones started cracking.

Standing next to him, I didn't know what to do.

I just stared at him, my mouth dry.

Miss Park used this moment to pull me away from him.

"Let go of me, please" I whispered tiredly, trying to fight her off.

He then started attacking the others until Cheong-san started whistling Gyeong-su's favourite song. 

Gyeong-su turned to him and started running towards Cheong-san who was sitting by the window.

It was that little melody Gyeong-su always whistled when he tried to make us laugh.

At the last moment, Cheong-san jumped out and grabbed the hose while Gyeong-su fell out of the window, to the ground outside.

My knees gave out as I turned into a complete mess.

Not had I only lost my best friend, but now also my brother?!

I felt the emotions overwhelming me.

I wanted to scream, but nothing but sobs left my mouth.

How could this have happened?

It was right after Na-yeon visited him...

I inhaled harshly as I turned around to her, looking into her unbothered face as the realization hit me.

"You..."

"YOU DID IT"

 I jumped up, feeling sadness turn into rage.

Cheong-san ran over to me and held me back.

"No let me go, you did this!" Tears forming in my eyes as I tried running to her.

"What do you mean?" He asked.

"When this bitch went to Gyeong-su and wiped his hand with that napkin...it was already bloody before. I also saw her standing by the mop that Su-hyeok stabbed the zombie with" I cried.

Everyone turned to Na-yeon.

"She's lying" Na-yeon simply said.

I threw Cheong-san's arms off of me and ran at her before pushing her into the wall behind her, making her shriek.

"You're such a bitch!" I cried.

Su-hyeok came over to us before I could start hurting Na-yeon more as he back-hugged me, trying to stop me, which worked as he held my arms to my sides with this movement.

I felt as though I was about to faint.

But not because of Su-hyeok this time.

Letting myself lean into Su-hyeok, I saw something dripping onto my jacket.

It was one of Su-hyeok's tears.

"Why is Gyeong-su so important to you anyways?" Na-yeon yelled at me.

"He's my brother, you psycho. And it's because of you he's not here anymore" My bottom lip quivered as the others looked at me in shock.

Even Na-yeon's eyes widened.

"...Your brother? Why didn't you tell us?" Cheong-san asked.

"Because I just found out about it myself. But that doesn't matter! Right now, I just want to get revenge for Gyeong-su since Na-yeon infected him!"

"Do you believe this, Miss Park? She's acting like a psychop-" Na-yeon was interrupted by Nam-ra:

"You're the one who did it"

"What are you talking about now? What did I do, huh? I didn't do anything to Gyeong-su!"

"I didn't say anything about Gyeong-su"

Then Nam-ra almost instantly told us her observations that were almost exactly like mine:

She pointed at the broken mop.

"You wiped that blood with your handkerchief."

"No. I didn't"

I sat down with Su-hyeok cradling me in his arms as he also listened to the conversation intently while placing his chin on my shoulder.

I felt drained, but at the same time relieved, that Nam-ra had also seen everything.

I needed justice for Gyeong-su.

"You wiped that on the scratches on Gyeong-su's hand" Nam-ra continued, a serious look on her face.

"I did not"

"It's in your pocket" I added.

Nam-ra looked at me with a sorry look.

I knew she was feeling bad for me because of the state I was in right now.

Na-yeon turned to me.

"So what?" 

"Take it out" Nam-ra sternly said.

"No"

Nam-ra lifted her hand to Na-yeon, awaiting her to hand it over.

"Take it out"

"I said no" Na-yeon slapped Nam-ra's hand away.

"Should I take it out?"

Then she quickly tried getting it, while Na-yeon held her off.

"Fuck you! Who do you think you are, class president?!"

Nam-ra slapped Na-yeon hardly.

"You never treated me like a class president"

"Nam-ra, that's enough" Miss Park said, trying to stop the two from fighting even more.

"Nam-ra, Y/n, do you two realize what you are saying right now? If that is true, it means Na-yeon... killed Gyeong-su"

"And it is true" I muttered.

"Yes, Na-yeon did it." Nam-ra also said.

"She killed him"

I looked at the others, who all had shocked expressions.

Na-yeon reached into her pocket, pulling out the handkerchief.

"You fucking cunt"

Then she threw it to the ground.

"There, happy?"

It had landed right in front of me, so I let go of Su-hyeok and stood up as he did the same.

I picked it up and went over to Nam-ra.

I looked at it carefully.

"This is blood" I stated the obvious.

"I wiped Gyeong-su's hand"

"This is his blood?" Nam-ra scoffed as she looked at it too.

"You can't tell?"

Nam-ra held it towards Na-yeon's leg that had a single cut on it.

"Then put it on your wound"

"Wipe yourself with it if you're so confident" She handed Na-yeon the handkerchief.

"Like his blood is so clean?" Na-yeon sneered, still trying to look innocent.

"He was a zombie"

As Nam-ra threw the handkerchief to the ground, she yelled:

"He was just fine until you infected him with your handkerchief"

"Na-yeon, you really-" Cheong-san stepped towards us, but Su-hyeok stopped him.

Na-yeon picked up the handkerchief.

"Damn it! It wasn't me! I'll prove it if you want it so bad."

She held it over her wound.

End of chapter 11

I am really sorry for killing Gyeong-su, I wanted to save him, but it wouldn't have added up with the storyline.
I can understand if you will be mad at me for killing him, I am pretty sad about it myself, but I still hope you'll find the rest of this story interesting.

Stay safe everyone!

~Brianna