개천에서 용 난다 – Gae-cheon-es-eo yong nan-da
Gae-cheon = tiny mountain stream
es-eo = from
yong = dragon
nan-da = appears

Literally => A dragon appears from a tiny stream.

In the orient a dragon is a great creature of blessing. All the stories about dragons talk about them coming from the depths of the sea. There are no stories about dragons coming from shallow mountain streams.

When someone says, "Gae-cheon-es-eo yong nan-da" or "here is a dragon from a tiny stream", it means that a great human being has arisen from among very humble circumstances. Just as unexpected and astonishing as it is to see a dragon rising from a tiny stream so is a great man or woman with humble beginnings.