Where does happiness come from? (need correction)

I am seeking a way to be happy.
When I was in Korea, I was unhappy because I had to work to become a competent person in the future, sacrificing present moments.
So I left Korea, for a while. Now I am in Australia as a traveler.
Nowadays I think about 'What defines a person's happiness?'.
In my case, in Korea, I thought the answer would be 'social success',which means to be a competent man who makes a lot of money.
However, here in Australia, when I meet people from other countries, I see I was wrong.
Now I come to think a lot about my life, and happiness.
So I want to ask you, what are your thoughts about factors that contribute to your happiness?