I found this info at Twitter (yeah..again!XD)

It tells that Niel bought a pair of shoes to Sungyeol as a gift then he tweeted 

"그냥 내 신발 사면서 갑자기 형 생각나서 하나 샀어 ~~ 잘 신어~~! ㅋㅋㅋㅋ. pic.twitter.com/IIEADp3Q9d"

[TRANS] Suddenly think about hyung while buying shoes for myself so I bought one for you too~~ wear it well~~!ㅋㅋㅋ

[Note from Niel] Thank you hyung for taking care of me my during my promotion. Lets work hard together in the future. Wear it well!

aww yeol's tweet reply to Niel :

[TRANS] 130510 @Seongyeol1991 "i will use it well!!! lovely niel niel niel, thank u!!! u have suffered a lot~ go home carefully! good night!"

Gwiyeopda! Yeol surely a nice person! Niel too! X3

You can follow Niel @AH_NIEL_ and sungyeol @Seongyeol1991 

cr: @seongyeolFACTS