It has been consulted with a knowledgeable Imam and a knowledge Muslim brother about the issue. What they concluded is that letting beard grow is 'CLOSE TO' fard in most opinion, but some consider its fard (as brother Al Ummat stated).
I asked it again in here and in hope for a even more detailed and professional Islamic explanation on it so more brothers have similar situation can benefit from it, inshaAllah.
For my particular situation, both of them agree that I should stay in the job because that fact that I need to support the family and meanwhile looking for another job that comply with our Islamic standard on beard.
NOTE: I do NOT clearly remember what is the regulation stated that its ok for me to do so, so I will not take it as a final answer, but if you think its helpful for you anyway in determine it, I will be very happy.
I am still looking for a suitable job for my further development since the current career I am in is NOT of my profession, and inshaAllah, Allah will guide me to the career I so far deemed as halal and what my passion is (web development).
I quit the job alhamdulaylah, inshaAllah, may Allah bless the act, ameen.
"Allah is the true and only provider for believers"
Alhamdulaylah, its so blessed to did Allah allowed me to achieve. Now, I am capable of paying off my loan without even worry about money and more. alhamdulaylah. Its amazing how Allah swt reward and bless one with so much mercy and surprisingly wonderful! Put your trust in Allah swt, he will reward you abundantly inshaAllah, ameen! Do what pleases Allah swt, and you will NEVER regret, inshaAllah! Lesson learned, again and again, alhamdulaylah!