Textbook vs Real
Textbook돌아오세요dol-a-o-se-yo
Real돌아와dol-a-wa
Why Koreans say it this way
Heart-wrenching one-word plea. 돌아와 (casual imperative) vs 돌아오세요 (polite request). When you're desperate, you don't use polite forms. The raw ~아 ending carries all the emotion.
From: 사랑의 불시착 EP16