Have you seen this interview?

http://hitoritabi.tumblr.com/post/97854921452/lee-jong-suk-for-nylon-oct-2014-part-1
 

"Nylon: For example, the loveline between Namsoon and Heungsoo in 'School 2013'?

Jongsuk: [...] When Filming 'School 2013', someone Released a Cut Version of All the Scenes BETWEEN Namsoon and Heungsoo. Even watching it myself, I Feel That Namsoon and Heungsoo act like THEY are in a love story. Even though it is a friendship, it's deeper than just a friendship. Hehe."

Jong Suk admitting the OTP is real once again <3 ;_;