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.
Some Korean women, especially older ones, tend to have a fantasy of meeting a foreigner and escaping patriarchal Korean society. You are clearly a more positive alternative than marrying a Korean guy and having to deal with an evil Korean mother-in-law or other intrusive family members.
When a Korean girl dates a foreigner, they are scared that their new boyfriend may think they are easy.
Your goal is not only to travel, work or study here, but also to live here and experience the culture.
Pushing for ‘skinship’ or something more intimate too soon will cause her to doubt your intentions.
If you are a white, young, and somewhat handsome, male then a lot of Korean girls will quickly and automatically judge you as some sort of playboy or womanizer.
She may be aggressive about this, so be ready to hand over your phone.
She wants to check your messages and photos and interrogate you about every female name and photo.
So you start dating a local Korean girl, but quickly discover that dating a Korean girl is quite different than dating back home.