Heechul oppa's message before leaving:

I was literally crying out  tears while watching one of my favorite big brothers in Kpop, Heechul oppa leave his message. So Yesung oppa, you'll be the temporary leader when Teuki oppa follows Heechul oppa at the army.

Sohee even called Heechul oppa in Youngstreet and he was so happy:

I'm sure Sulli missed Heechul oppa and cried too. Because Sulli is Heechul oppa's godsister which means they have the same godparents.

My very own message to Heechul oppa: [Teukie oppa will have one too. ~T-T~]

Heechul oppa have been one of my favorite big brother from Super Junior. I totally cried when I watched your last message in Inkigayo. Teukie oppa was crying a lot too. You even patted Sulli's head. I know she'll be crying too. I was so happy Sohee called you in Youngstreet last night. You were so happy. I was like crazy. you made me laugh while crying because of your scream when you knew its Sohee. Oppa It was such a bad timing cause I'm gonna go to Korea so soon and then I can't see you there for 2 years. I'm sad but I know God made this happen because there is a reason behind it. I was always been happy to have the same eye smile as Sulli's. It felt like I was also your godsister. And Sulli's my favorite. I was afraid that this moment will come that one of my big brothers will go to army. I'll promise to visit at your army IF I can. I will seriously gonna cry oppa. I really want big brothers who will pat my head and protect me. Its because I don't have a big brother. Only big brother cousins but they are away from us. I also like big sisters but big brothers really made a mark on me. I have a vast list of Big brother and big sisters. And you're one of my favorites. Also Onew oppa,Hyunsseung oppa., Sunggyu oppa, Dongwoo oppa, Donghyun oppa, other Suju oppas. I was asking God why you had to be in the army when I'm gonna be at Korea soon. I hope my tears help you to have fun and work hard in the army. I really really know there is a real reason why God had to make you and Leeteuk oppa come in the army now. Heechul oppa come back Ok? You'll need to practice again with Suju oppas. Like Sulli,  it has been a habit of mine to imitate you.

Like this:

Or this: 

Heechul oppa! Remember... We'll meet someday! Fighting! ~T-T~    ~^_^~