...but just LOOK at them!

and in private too (backstage and out shopping together):
  

this is cut from an interview key did on sukira (I have emphasized the parts I find relevant):
Leeteuk: Do you remember me giving Woohyun & Sunggyu's numbers of Infinite to you? On Monday, I saw you texting Woohyun.
Key: Ah I see. For Sunggyu, it was his birthday recently and I just text him once in a while.
Leeteuk: Oh really?
Key: Yes, but with Woohyun, I feel like I found another me when I contacted him. This is a really good fate!
Leeteuk: I thought he was texting his girlfriend. He was brushing his teeth in the bathroom and kept texting instead, so I told him "Woohyun, can you text your girlfriend after you're done brushing your teeth?" Then he said to me, "Hyung, it's Key~"
Key: It's always like that. s and our members always ask us what we are, but it's so fun talking with him.
Leeteuk: We hope that you officially announce the relationship between you two on Sukira.

on infinite's album in the 'thanks to', woohyun mentioned key:
"...and to my other half who listens to all my problems, kibummie~~~"

you can say what you want, but I ship this.