Showing that they are really 'good friends,' Lee Kwang Soo revealed his co-actor Ji Sung's drinking habit.

On June 12, actors Ji Sung, Joo Ji Hoon and Lee Kwang Soo were in attendance during the press conference for their film "Good Friends."

"We all have dinner together or drink out, but no one really takes initiative or organizes the meetings; we just go along with the atmosphere that we have during filming," said Joo Ji Hoon on the closeness between everyone on set.

He also revealed that Ji Sung and Kwang Soo are the best drinkers.

On Ji Sung's drinking habit, Kwang Soo revealed, "Ji Sung talks to himself a lot when he gets drunk. He starts sharing things about his past, and he goes on and on for a long time. It's nice the first couple of times, but after a while, you get tired of reacting to what he is saying."

Ji Sung then retaliated, "You're starting to make me mad. I also have a lot to say about you."

"Good Friends" is an action-crime film which focuses on the struggle of three friends to maintain their loyalty and trust towards each other amidst a crisis that would challenge their lifelong friendship.

The movie will premiere on July 10.