What is this Chinese movie called?

I saw this movie on my way to china on China Eastern Airlines. It was about a guy that has a crush on the girl in university. They live in the same area, take the same bus and take the same route home. Then something happened that I don't remember but they talk to each other and the girl finds an abandon house and cleans it up to take pictures. I also remember they had a Sony Walkman and had this CD that they listened to and at the end of the movie, he gave it back. Then the movie goes to the guy smoking in an office building and all grown up. Then the girl he liked about 5 years ago(I think) came up to him and asked him to design her a house. Her father never had time to build it and was in the hospital at that time. At the end of the movie, her dad finds a picture of him on her iPhone and asks "Who is that" and she replies with "Hes just… A friend"
Then I cried.
I don't remember any names but I think the area that they lived in was jungguhou something and her name was seong juong or something. It may be Korean but I'm not too sure. I have been looking for that movie for ages

Sorry, i wish i had an answer, but i do have a suggestion, if you will. There's an old foreign film i adore, it's called "the road home".It's simple, and so sweet. If you enjoy foreign films, i think you would like this one.