On a recent airing of SBS Power FM 'Choi Hwa Jung's Power Time', Lee Seo Jin revealed the behind story of his kiss scene with After School's UEE on the drama 'Marriage Contract'. 

Lee Seo Jin said, "Since there were a lot of kiss scenes, I came to wonder how I could make it more special. I wanted to create a memorable kiss scene." He continued, "My attempt to create a special scene led to it being very passionate." 

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He also talked about UEE's playfulness off the screens and said, "I often playfully grab UEE's collar because she's cute. Then UEE has the habit of making a kissy face, and saying, 'You can hold me, but I know you can't really kiss me'." 

Sounds like Lee Seo Jin and UEE are close both on and off the screens!