The first time i watched the movie i didn't totally understand it but after i read on wikipedia where they had explained the movie perfectly i now understand some things and i love it even more now. There are some things they could have explained earlier or better in the movie like i didn't understand why only one person could see her all the time or why she didn't know him in the end and how he could stay in the past with her. But overall this is still the best taiwanese move i have ever seen!
http://www.dramacool.com/drama-detail/apgujeong-midnight-sun
http://www.dramacool.com/drama-detail/apgujeong-midnight-sun
And this is the fb page i shared the link on https://www.facebook.com/cindy.zhang.543