How a shy boy from North Korea became one of the world's scariest dictators

For the past 50 years, the world has grown used to crazy threats from North Korea that don't lead anywhere.

But the threats have taken a decidedly sharper and more ominous tone under North Korean leader Kim Jong-Un, the third Supreme Leader of the Hermit Kingdom.

On Wednesday, North Korea claimed to have successfully detonated a miniaturized hydrogen bomb.

Here is how Kim Jong-Un grew into being one of the world's most concerning world leaders.