Even if you are from Busan, if you live in Seoul for over 15 years

Doesn't your dialect automatically convert to the Seoul accent?
I don't know if it's because I moved up here when I was young, but when I speak in the Seoul dialect,
no one ever notices that I'm from Busan.
Honestly, I feel like if you pay just a little bit of attention, even if someone from Gyeongsang-do speaks with a Seoul accent,
people would just assume they are a local Seoulite.