Lee Jong Suk sat down for an interview with entertainment outlet OSEN last January 21.

While talking about the concept of friendship, he shared, "There are not a lot of people I could have conversations with. My friends who aren't in the entertainment industry couldn't sympathize with the kind of job I have, while celebrities have a lot of things to hide to be completely truthful."

As expected, he mentioned his own best friend, Kim Woo Bin, "Despite the constraints, I'm very close with Kim Woo Bin. We gossip amongst ourselves."

"Even on the way here, I was talking to Kim Woo Bin on Kakaotalk. We've been talking a lot lately," he shared.

He also mentioned an instance when he was jealous of his own friend. He admitted, "I was envious of him when he filmed a commercial with Lee Na Young. If he did a project with her, shouldn't he at least get her signature? I'm a big fan of Lee Na Young. I told him to get me her signature the next time they film a commercial."

Lee Jong Suk is currently promoting his movie "Hot Blooded Youths" which scheduled to premiere on January 23.