I'm seeing a lot of questions regarding the ending of the story. And at the end of the movie, notice that he faced his mother but turned right away to Yong Joon. It's either he remembers everything but pretend not to or he really can't remember but trying to,. Just look at the way he stares at Yong Joon, I'm pretty sure he can still remember something between them.

But watch this part, 44:25 ( It's self-explanatory). I'm pretty sure Soo Hyun will remember all what had happened between them. And if in case, I hope his mom will get over it and let them live happily. I tried watching this, like, 2x for me to understand the story..

The problem about this movie is that they didn't even show that Soo Hyun and Yong Joon are happy. It really sucks ending a movie with a dim light (it means sad). It would be perfect if they ended it like they went on a picnic or at least day time or whatever.