I met a language exchange partner in Korea. She's 3 years younger than me. I told her twice that she could use panmal with me, but she keeps using chontaemal.
Should I tell her a third time to use panmal? What is customary in Korea? I am confused...when my Sunbaes told me that I could use panmal, I started using it right away with them. Is that considered to be rude? Is there supposed to be some mandatory waiting period before using panmal even though an older person said that it was okay?
It's confusing to a Korean-American.