Lee Jong Suk and Kim Woo Bin have been spending so much time together lately that some netizens have wondered exactly what their relationship is.

The two friends have known each other since their modeling days and they became even closer after they appeared as friends-turned-bitter-rivals in the drama "School 2013."

In real life, the two remained friends and never became rivals.

"There isn't really any competition between us," said Lee Jong Suk. "We support each other's efforts and talk often."

But some netizens are now wondering if the friendship has turned into something more serious.

Lee Jong Suk is getting lots of attention for his role as the mind-reading student Park Soo Ha in "I Hear Your Voice" and he's preparing for the film "No Breathing." Kim Woo Bin is appearing as Sung Hoon in the film "Friend 2" and has been cast in the highly anticipated upcoming drama "The Heirs."

Despite their busy filming schedules, the two recently modeled together in both a fashion shoot and a beer commercial. They put on trendy suits for the clothing brand Trugen and then the two 24-year-olds played water games in a Cass beer commercial.

On a recent episode of "Entertainment Relay," Kim Woo Bin decided to respond to the subject that netizens had been buzzing about.

"I know that there has been a lot of talk about us having a relationship," said Kim Woo Bin. "I think our friendship on the set of 'School 2013' contributed to that."

It probably also helped fuel rumors when the two actors had a kissing scene in "School 2013." And it may have helped that Kim Woo Bin said that he and Lee Jong Suk were going for the "Best Couple Award."

On "Entertainment Relay," Kim Woo Bin did not out-and-out deny the dating rumors but chose to focus on the friendship.

"I believe friendship is a kind of love too," he said. "When I first started modeling, Lee Jong Suk was already working in the field. I had to bow to him because he was more experienced than I was and I was really polite to him."

How did netizens respond to this vague answer? Whether the relationship turns out to be fact or fan service, no one seemed terribly shocked and many comments focused on how good they looked together.

"If he can't be mine," one netizen said of Lee Jong Suk, "I hope they end up together."