I found some bug maybe good for player
First, after you change class you got 0 skill points and you can't up skill immediately. Just save your game and load it immediately, all skill points back to same as your level and can up max all skill. You can do it with 2nd,3rd too, it work well.
Fix the skill points after change class too ( if player train up level 11 and change first class job level 10 at abandon church, they will lost 1 skill points and can't max skill first jobs )
Second, you can farm free hero badge without join any game's event. First, you need up level 5 and keep your level 5 novice box. Make full your bag by buy some items ( i recommend buying some different potions like blue, acid, fire potion at tool's dealer npcs). Then save your game, click open the level 5 novice gift box and surprise. The novice gift box 2 and advance field manual drop to the ground

Then load your game immediately ( the drop gift box 2 and annual still in ground and your novice 1 still in your bag). But the second time load will lose 2 novice item ( weapon and shield), you need back to tool's dealer and buy some potions for full bag. Then start annual and box novice farm ( open box get 5 hero badge each box)

Keep load and open novice box 1, more free annual and free box . If you have high level char and still keep the level 5 box, you can farm faster than the level 5 , many box will drop in time
Third, the event " Hall of survivor" bug, if you have enough hero badge ( 5 hero badge) and click join that event, it will warp you to the event place without the require level 99+ and without the notice " You are too weak to active this event" like Boss Rush Event, also lost hero badge too. It work with Red team and Blue team too, lost 1 hero badge.
The next bug is you can wear any equipment you want without class require and get the bonus from it too. If your pet kill mobs, you can't get any experience.
Last, this game is pretty boring because train up level so slow, kill monster , dungeon and boss, the exp rate very slow. And don't have any quest ( if the game have, I so sorry about say so ). The money only 2 gold per monsters will kill player too

It should be 0.2 x each 10 level monster ( level 1-10 monster get 2 gold ) or higher would be better
P/s: I love the game music and at F9 i love your " Chruch" -.-