His girlfriend disappeared, he cannot figure out why...

His long dated girlfriend disappeared without leaving a word. He cannot understand why. After being troubled by this for several months, he finally recalls that right before his girlfriend’s disappearance, she asked him that whether he remembers the temple they used to play when they were young, so he went there for clues. He finds a man who sells old-fashioned chilled water, and a girl holding a goat in her arms. He sits together with them under a big tree and they talk about all kinds of trivial matters and the philosophy within. And through these trivial matters, he reviews his relationship with his girlfriend. Upon leaving, he seems to understand something, though very subtle and vague.