우공이산이 · 우공이산을
perseverance that moves mountains
Example
우공이산의 마음으로 매일 조금씩 공부하고 있어요.
I study a little every day, believing persistence can move mountains.
Word parts
우 foolish+공 old man+이 move+산 mountain
From the fable of 'the foolish old man who moved mountains' by digging stubbornly.