Here is a 9Dragon guide to getting the higher level GK titles, and hope it can help some game players.

Basically to get a GK title, you need to outstrip your BK title. What this means is that if you have Dark Heart, you CANNOT get Brave Heart due to them being the same level title and BK overriding GK. So once you get this into your head - yes, the path to a high GK title is very long, expensive and not for those who give up or die easily

So in order to outstrip your BK, you basically have only one option and that is masked PKs (PKing people who are wearing masks.) You get 30 GK and 5BK, so your GK count will always be higher. The problem after that though is that you need to "clean" out your BK (take it to zero or sub 1000). The reason for this is the requirement for Noble Soul is 10,000 GK whilst Ignoble Soul is only 1,000 GK. So when you get a mask PK, you get a 6:1 ratio of GK:BK but to have noble soul, you need at minimum, a 10:1 ratio. So you gotta get rid of some BK. The best way to do this is to either a) get PK'd a lot by people 24 levels higher than you or b) die a lot . Dying is a very expensive (in terms of GK lost) but very quick way of minimising your BK. You lose GK and BK equal to your level/10 so I suggest doing this right after you level so you don't lose exp. Also don't have a high BC So the following calculations will use these parameters.

- 8690 GK until Noble Soul (i.e. your GK is at 1310)
- 906 BK until Ignoble Soul (i.e. your BK is 94)
- Roughly EC4 level (For sake of rounding and calculation easiness )

This will give you the Brave Heart GK title. Don't forget again that your BK cannot exceed 1,000 to get Noble Soul. Here are the calculations.

8690/30 = 290 mask PKs until 10,000 GK
290 x 5 BK = 1450 BK

So you think you have enough karma? Sadly not.

You must die at least 500/2 = 250 times by mobs to "clean" BK.

The best way to die this many times is wait until you level - then go to NSIP, find a patch of nice, high mobs that can one hit kill you and just let yourself die over and over and over, using "revive here". Watch the magic that is your BK being lost (and the horror of the precious GK >_<)

So:

250 deaths = 10GK lost per death
Therefore 2500GK lost to make BK = 0
Will thus have 7,500 GK and 0 BK
2500/30 = 84 mask PKs
84 x 5 = 420 BK
Thus end result is 10,000 GK and 420BK, and Noble Soul title

Also the cost of this is fairly high. Don't think you can do it at RL or FD because the cost of masks alone will over 4 million (just based on this calculation) 

Give credit to reece22345.