Based on the level of respect or formality, you can say "I like Korean" in Korean in 3 ways:

• Informal: hangugeo-ga joa. (나는 한국어가 좋아.)
• Formal: na-neun hangugeo-ga joayo. (나는 한국어가 좋아요.)
• Very formal: jeo-neun hangugeo-ga jotsseumnida (저는 한국어가 좋습니다.)