That kind.

That kind of friend that you think they might be too quiet or you have not much topics to talk with, least humor sense and not fun to be around but when you are in troubles they have your back, support you and help you. 

That kind of friend that you seldom keep in touch and you somehow never treat them as so called BFF or you think that they keep things to themselves and you don't really understand them or have no time to bother what's on their mind but when you need them, they are always there for you. 

I will be that kind of friend. 

The true one. 

To be better and be good :)