6. Phone Behavior: Constantly on Silent or Flipping It Over

Watch his phone behavior. If he constantly keeps his phone on silent or flips it face-down whenever you’re together, it might be a sign he’s trying to avoid showing messages from someone else—likely a significant other.

Evidence: Korean couples often text and message each other frequently, so if he’s hiding his phone or acting overly cautious, he might be hiding communication with his partner.