Korean women are really the best girlfriends to have in the world.
A Korean woman depends more on her family for support than a western woman.
Don’t whine about it being your personal privacy, just hand over the damn phone. The act of allowing her access to your phone will go a long way in gaining her trust quickly and destroy her suspicions.
If you are stubborn and insist on not showing your phone, she will eventually get her hands on it and check it whether you like it or not.
She wants to check your messages and photos and interrogate you about every female name and photo.
If you decline her requests to see your phone, then you are automatically guilty as a womanizer.