How to identify a good girl in a short period of time?

I have a very unorthodox method

Applicable to both men and women

Observe the other person's reaction after appropriately showing kindness

This largely determines their thinking logic, behavior patterns, and moral character

If the other person tries to use your kindness and love to manipulate you, you can basically consider running away

If the other person reciprocates kindness and responds in kind, don't interpret it as "people who don't like you are just being polite," as people nowadays are not that idle; the other person is probably a good person