Tamer Saga - How to earn unlimited AP (Atack Point)/Stamina

In Tamer Saga, each battle will cost 1 AP (attack point) or other game called stamina. And the character will gain 5 AP every 30 minutes. but when you rush in leveling its will reduce very fast,
How to get more AP?

the system enable you to rest the char in the city, simply by moving your character back to city and click Rest icon.

or..
you can buy AP and pay with crystal
simply by open your profile and click the small blue button next to the AP bar
the system will confirm the amount of crystal to pay, click Confirm

but how if you run out of crystal?
buy it from mall, or... use your dummy account and send huge crystal pack to your main account

first, log your dummy char in, since all new player get 50K voucher, you can use it to buy 99 pack of huge crystal then send to your main character,

1. use your main character and send a whisper to your dummy char

2. from your dummy account, click your main character name who send a whisper, and click add as friend

3. open mall, then click donate on Huge  Crystal Pack

4. on the donate window, fill with 99, select your main character name and click donate

ok thats all, you can donate any item from mall to your main character