가장 친한 친구
How to pronounce it is this:
kah-chang chin-han chin-goo
안녕 친구 - aunnyong chingoo means hi best friend aunn-yong chin-goo
젊은 친구 = younger friend
gajang chinhan chingu
Saranghae chinguyah~
chingu
Chingu (friend / pal)
"Do your best" translated into Korean is "최선을 다해".
우리는 최고의 = we are the best
sah-dahng-heh
You can say "My best friend was named" or "My best friend's name was."
여자친구 yeo ja chin gu
you are my best friend