Blessing in disguise
I failed an exam to enter a company last year. But the company was reportedly bankrupted. It was a blessing in disguise.
It means a hidden luck. It looks like a person is unlucky at the first moment but, it will change at the last.
We also have similar proverb in Japanese. "Banji saiou ga uma." Once upon a time, there was a guy. One day, he fell down from his horse and he broke his leg. He felt unhappy at that time. However, his country would begin a war and the young guys from his village went to the war and died. He couldn't go because of his broken leg. So, he survived from the war.
Refs
proverb, 13-12-24 22:47, 13-12-28 08:58, Yosei