What Does "jinsim" (진심) Mean in Korean?

This word emphasizes the depth of one's feelings or intentions. When used as an exclamation, '진심?' (Jinsim?) it often implies 'Are you serious?' or 'Do you truly mean that?'. It's commonly used among friends and close acquaintances when expressing strong emotions or seeking confirmation of authenticity in a casual setting. It can be used both when conveying your own sincerity or questioning someone else's. Using it in formal settings or to elders might sound too blunt without proper honorifics.