Lee Joon opened up about the difficulties of filming kiss scenes during an interview with News 1.

Currently, Lee Joon is starring alongside Choi Ji Woo and Joo Jin Mo in the drama 'Woman Who Pulls a Carrier' on which he recently completed a kiss scene with the female lead. When he was asked about this kiss scene with Choi Ji Woo, Lee Joon shared, "Kiss scenes are hard no matter who you're filming it with. I mean, you have to kiss someone who's not really your lover." 

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He continued, "I try my best to end it as fast as I can. And to end it fast is to really do it. You don't know how your partner's feeling, so it's important to be considerate. For 'Heard It Through the Grapevine', I had to kiss Go Ah Sung a lot, and it made me realize that this is a sensitive job requiring consideration for the other."

Again, Lee Joon emphasized, "You have to do well on the first try. If you make a mistake, then it seems like you have other personal intentions and going on the second take makes it awkward. You have to do it well once with sincerity."