Will You Marry Me? (2013)

At the beginning of the film, there's a girl who's walking. As she walks, there's someone who is following her. She walks inside the park, someone pats her on the shoulder and gives her a small folded paper. She wanted to tear it at first but decided to see what's written in it. It turns out, it was a marriage proposal from her boyfriend, John. The guy who was following her around turns out to be her boyfriend.