How to say I love you in Korean?

I love you (informal, to younger ones or your friends)
사랑해
Sarang hae


I love you (formal, to younger ones or your friends)
사랑해요
Sarang hae yo


유천아 사랑해~
Yuchunah saranghae!!! <3 font="">
I love you Yuchun

준수야 사랑해~
Junsooya saranghae!!! <3 font="">
I love you Junsu