파란만장이 · 파란만장을 (usually 파란만장한 + noun)
full of ups and downs, eventful (life or history)
Example
할머니는 파란만장한 삶을 사셨어요.
My grandmother lived a life full of ups and downs.
Word parts
파 wave+란 billow+만 ten thousand+장 ten feet
Literally 'billows ten thousand jang high' (a jang is about ten feet) — a life tossed by enormous waves.
Good to know
Almost always appears as 파란만장한 삶, 인생, or 역사.