사 랑- Love.
sarang
사 랑 해-(saranghae)I Love you. It is used to person whos younger than you.
사 랑 해 요-(saranghaeyo) I love you. Used to people older than you. Add 'yo' '요' in the end to formalize and add respect.
사랑합니다 - it is often pronounced as 'saranghamnida' but written as 'saranghabnida'. Its the most formal form of I love you
