If you want to know what to expect from Yoo Yun Suk's eventual kiss scenes in Jeju Island Gatsby (aka Warm and Cozy), just ask his costar for the new movie Perfect Proposal, Im Soo Jung! In a recent press conference for the film, the actress spilled the beans on locking lips with the handsome actor.

When asked about Yoo Yun Suk leading the kissing scenes, Im replied, "It was 10 out of 10. He was really good. I trusted and followed him." So there you have it, folks — a perfect score! And this is coming from a veteran actress who has shared the screen with Hallyu kings like So Ji SubRain, and Gong Yoo, just to name a few.

In the movie Perfect Proposal, which premieres June 4, Yoo Yun Suk makes a deal with Im Soo Jung to turn her into a Cinderella so that she can seduce a wealthy chairman. In return, she must split half of the fortune with him. Things don't go according to plan, however, as they begin to fall in love and have a hard time hiding their true feelings during their dangerous game of power.

At the press conference, Yoo Yun Suk was asked to choose between his Perfect Proposal costar Im Soo Jung and his Jeju Islad Gatby costar Kang Sora. In response to a question about which woman he would like to tempt, the ever-diplomatic Yoo replied, "I always choose the person I'm next to. Im Soo Jung." Quick thinking!

If you want to see for yourself if Yoo Yun Suk can maintain his 10/10 kissing reputation, watch him in the new romantic comedy Jeju Island Gatsby: