People always start as happy, with very rare exceptions. They are happy because their lives are very simple, nothing to ruin the harmony... Not yet...
Then something happens, something makes him sad. He wants something to happen but it doesn't. The harmony is broken. This makes him sad. He might want to look for a solution to the problem. Once he finds it he is back into harmony with himself, with the others etc.
Nu e o compunere completă, dar cred că poți să mai dezvolți de la ea :-??