Minor point but the following isn't a Korean proverb:

>When you laugh, the world laughs with you. When you cry, you cry alone.

It was in the film Oldboy but it's actually from an English-language poem. Ella Wheeler's Solitude:

  Laugh, and the world laughs with you;
  Weep, and you weep alone.
  For the sad old earth must borrow its mirth
  But has trouble enough of its own