Based on the level of respect or formality, you can say "I am a hairstylist." in Korean in 3 ways:

• Informal: na-neun heeo seutailliseuteu-ya. (나는 헤어 스타일리스트야.)
• Formal: na-neun heeo seutailliseuteu-yeyo. (나는 헤어 스타일리스트예요.)
• Very formal: jeo-neun heeo seutailliseuteu-imnida. (저는 헤어 스타일리스트입니다.)