2. He’s Hesitant About Sharing Personal Details

If you’ve noticed that the guy avoids sharing too much personal information—like his home life, family, or what he does on weekends—it could be a sign that he’s hiding something. Married men or those with a girlfriend often maintain a degree of secrecy about their personal life to avoid raising suspicion.

Evidence: In Korea, privacy is highly valued, but someone who’s overly secretive about simple details may be concealing a relationship.