One can really get when he has to repeat a level over and over again before he can move on to the next. Though this is really common to most newbies, one can’t still help but get annoyed at times. I am sure you are like this as well when you play mu online for the first time.
Again, this might be normal for newbies but there is also a good chance that you have done something wrong along the way. Check out this most frustrating mistakes an online gamer can make and see if you have done some of them:
When you miscalculate an action and you end up missing your target. This can be frustrating for sure especially if you already do this a number of times. Though this can happen, maybe you also just hit the button too early. Note that it is all about how you press the controls thus if you miss the mark the first time, you can change your way of pressing them.
When you are too impatient to strategize and you just head on a number of times doing the same thing over and over again. Most of the times, you need to strategize. If you fail about something the first time, you should think why and improve it or try a different method. Maybe you need help from others as well, especially from the old-timers. This is the good thing about multiplayer online games, they usually have a community where most of the players hang out. You can also take part of this so you can ask assistance.
There is a good reason why you enjoy the Mu online game even when you fail a number of times. One reason is the fact that you can also earn money here.