I wanted to see them kiss!

The main actress Gianna Jun doesn't kiss in her movies, at least i haven't seen her doing any in My Sassy Girl or Windstruck or Daisy or The Uninvited.

In "Siworae", it wouldn't have made sense. Because in the lake house there was only one time line. But in Siworae, there were two. At the time the past Eunjoo was not aware of Sunghyun. So it would be very awkward for Sunghyun to kiss Eunjoo at the end of the movie because they were just "acquaintances" at the end of the movie.