Obviously she is not a friend.. He likes her.. for that reason she keep popping in his head and he put one of his shadow to protect her. Jinho is a family to him.
Sung is just an awkward sentimental lol. And he sees that friends all the time
Oh I know.. lol. I read the sub context of the pair. Still to call her his only friend. I could not let that go pass with out mentioning it lol.
Lol... but that was ironic, he was referring to his only friend because she said that in the gate.. if you read the novel you will see that there are more moments and stuff going on.
What about jinho... you know the one you saved!!! The one that been there as a friend from tge start of your leveling up.. well not the start start.. .but he is your vice guild master!!! He's your friend tooooooooooo.. still I loved it.