What Does "ppak-seda" (빡세다) Mean in Korean?

This term is quite informal and widely used among peers or in casual settings. It conveys a sense of difficulty and effort. While not offensive, it might sound a bit too casual if used with someone in a superior position or in a very formal context. It's common to hear it among students describing their exams or workload, or among workers talking about a demanding project. It carries a nuance of 'being put through the wringer' or 'it's a grind'.