Are Korean girls in Yanji really that open?

Not as open as you think. There are many kinds of girls' openness, and some are generous and talkative. This is a quality system and cannot be defined as sexual openness. It is the duty of every citizen to adapt to social development. You can't let a girl keep away from strangers and boys, just like in primary school, men and women don't talk. If the society is still like that, how can we talk about development? Therefore, you need to find a girlfriend, mainly your feelings. If you like it, pursue it. Opening up means rapid economic development, not girls' sexual development. Don't confuse concepts.