Ji-na pov: 

It's been a little over a week since my brother has returned. I was having a great time with him. Every second I spend with my brother in joyful for me. He's my only family and I can't and don't want to think of how I will feel once he leaves again. Gosh, it never gets easier. Having to say goodbye to him every single time and not knowing if he may make it back alive is slowly killing me. I can understand why my mother used to spend hours crying when my father is away.

However, I always enjoyed my time with him, it was better.

It was another normal day at work, or so I thought. 

'' Something is happening '' Chae Young said as she entered the lab

'' What do you mean? '' Junho asked

'' There are a lot of people here and it's the first time I've ever seen them. They were all looking formal and all the MLS were with them. I am telling you something is on '' she explained

'' Nothing can be hidden from you, can it? '' I teased 

'' Unnie! '' she whined making all of us chuckle 

Even though we continued working normally, I had a feeling that what Chae Young said would in some ways be related to me. And as if hearing my thoughts, the door pushed open and Dr.Lee the head doctor in our laboratory walked in. We all stood and bowed at him. 

'' Choi, follow me, please  '' He said and held the door open.

We all knew how serious Dr.Lee was but it was the first time we've ever seen him like that. Which actually terrified me. 

Did I do something wrong? Did I make a mistake? Am I not good enough? Will they fire me? Does it have something to do with those men Chae Young talked about? 

I was following Dr.Lee quietly but my insides were boiling. We were taking ways that I never knew they existed. I was getting even more nervous when I realized that this part of the laboratory was restricted for us to enter into it. Simply because it was the nuclear section which wasn't our specialty. 

'' Excuse me, Dr but what are we doing here? '' I finally asked as I mastered some courage 

'' You'll know soon  '' and that was his only answer before we finally entered one last door. 

There was a huge table in the middle with almost ten men around it. I looked around and found that I wasn't the only scientist there. What's going on in here? 

''' Since Miss Choi is here now, I think we can start '' one of the suited men said 

'' Of course '' answered Dr.Lee 

'' As all of you knows, since the second world war, many countries have been working on the nuclear power and every government did its best to create something that can protect its country '' another man started

''  And our country was no exception '' of course, I already knew about that... how? easy: Seung Hyun 

'' Over the past two years, we have been working secretly on a new weapon that may be our winning card if something ever happened to us in the future ''

'' Excuse me, sir, but what does the nuclear power has to do with me?  '' I finally asked since I was the only scientist in the room that her specialty has nothing to do with all of this.

'' Of course, you have every right to ask this question. As you know, nuclear has some very serious effects on the human being and nature as well so we'd like to know what can this weapon do to us as human and if there's something that's wrong or missing we'd like you to find it '' told another man

'' Why me? '' I questioned

'' We have been regarding what you have been doing and let's say that it was impressive. You were the only one capable of solving many impossible problems, it's been a few years since we last found someone like you '' Dr.Lee answered this time 

'' Can I refuse this? '' 

'' Just try Miss Choi and if some time along the way you wanted to back out then just inform us. Don't worry you will take what you deserve of money '' the first man who talked answered 

'' Well, at least I can try '' 

'' If you just worked as expected then you won't ever regret it '' the man added and was he smirking? 

'' I think I should go back to my work now '' I announced and stood to leave

'' Jina, this is extremely secretive. You can't tell anybody about it, do you understand?  '' Dr.Lee warned and I nodded '' Not even your family, none but you '' he continued and I felt a little uneasy. It was hard keeping things from Seung Hyun 

'' What about the guys? what will I tell them now if they asked why you wanted me? '' 

'' Just tell them that I wanted you to work on a new case '' he answered and I was free to leave.

As I expected, as soon as I walked back, Chae Young bombarded me with questions but as I was told, nothing was told. I had a feeling that Leeteuk didn't believe me but I shrugged it off. Everything will go just fine... 

Once my work was over, I quickly returned home. Only to find Seung Hyun packing. My heart beats were fast and I was almost in tears. I thought he was going to leave already.

'' But you said you are staying here for at least a month '' I whined like a little kid

'' Well hello to you too ''

'' What does it matter if I said hello if I was going to say goodbye after '' 

Suddenly, Seung Hyun started laughing making me frown. 

'' Yah! What's so funny?! '' I shouted 

''  How dare you call me ''yah''! I am older '' he argued

''  Yeah, 5 minutes older. You never made me forget '' I said rolling my eyes 

He just ruffled my hair '' I am not leaving. You and I are leaving  '' 

'' What? Me and you? why? '' Why would I go with him if he's going to work? 

''  I am not going to work, we're just going on a holiday together with the boys to Busan. I promised you that we'll go remember? and since you're not working tomorrow then why not? It will be just tonight and we'll be back at tomorrow night '' he revealed and I immediately jumped and hugged him 

'' Thank god '' 

'' What? '' he asked while laughing 

'' I thought you were leaving and I was getting myself ready to throw my usual tantrum '' I told him and he laughed harder

An hour later, we were already in the train station. Jiyong and Seungri were already there and being his usual hyper self, Seungri was a moving joy bubble. Youngbae and Daesung haven't arrived yet. 

'' What's taking them this long? we'll be late  '' My brother complained

'' I told them to do something, they'll be here soon '' I assured him

'' What? what did you ask this time? ''

'' Wait and you'll see '' You're gonna hate me for this, I thought to myself '' Look! Here they are '' I announced waving at the three people coming toward us

'' Ji Hyun? What are you doing here? '' Seung Hyun asked right away

'' How rude! '' I muttered glaring at him '' Don't mind him, he's just being an idiot '' I smiled as I talked to Ji Hyun '' You didn't think that I will just accept to go one girl with five guys  ''  

'' You never refused before '' Seungr