Textbook vs Real
Textbook실례지만, 정신이 나간 건가요?sil-lye-ji-man jeong-sin-i na-gan geon-ga-yo
Real야, 미쳤어?ya mi-chyeoss-eo
Why Koreans say it this way
The most Korean reaction: 야 (hey, rude attention-getter) + 미쳤어 (are you crazy, casual). No Korean would ever use the textbook version in real shock. 야 is technically rude but universally used among same-age or in emergencies.
From: 오징어 게임 EP4