What Does "jinja?" (진짜?) Mean in Korean?

This is a highly versatile and frequently used expression in Korean daily life. It can be said with rising intonation as a question, '진짜?' (Really?), or with falling intonation as an exclamation of surprise, '진짜!' (Seriously!). It's common in conversations between people of similar age or status, and less often used formally, though it can still slip out in moments of strong emotion regardless of context. Its meaning is heavily influenced by the speaker's tone of voice and facial expression.