@emmasmart08: it's not bubble gum, it's white chocolate.
@Angel88: I know what you mean. I dont think park shin hye would just receive something like that from just somebody ㅋㅋㅋ I saw her other kiss scenes BTS but most of the times she closed her mouth tightly.
I actually think it's very rare for an actor to eat chocolate while shooting kiss scene. I mean people do something like that in their real-life kisses

From what I read and watch of some actors interviews, they usually do prepare themselves for kissing scene shoot. They usually brush their teeth, use moutwash, or take bubble gum before the shoot to ensure their breath fresh, geun suk did it too when shooting kiss scene in another drama like MMM but when shooting kiss scene, he ate white chocolate and even passed it to our shin hye while kissing her? And Shin Hye just opened her mouth and received it? And the most important thing is our shin hye wasn't shocked by the kisses since geun suk has told shin hye that they would have real kiss scene in eps 14, not like the first fake scene. However, it looks like geun suk saved a little secret that he would have that white chocolate because if we watch the BTS, there's a BTS scene which shin hye's back faced the camera and while she covered or wiped her mouth with her sleeve, she said something to geun suk and then we can hear he said "chocolate" but then shin hye still opened her mouth in the next kiss scene take even she didn't need to for the opened mouth kiss scenes never been included in the drama ㅋㅋㅋ
Anyway, I found another photo of their kiss scene shoot. This is not the white chocolate again but something else

cr: GSCI