Thank you so much for all the input! It is now fixed. Click image for larger version. 

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The culprit was the rear wheel hub bearing! When the hub is turned, doon po nalabas ung tunog.. Okay na po siya. Though, I didn't expect the price of the hub bearing. Ang mahal pala, around 2k ang isa.

Super thank you po sa mga inputs! Will be back, I can feel na maglalabas na talaga ang mga sira since the mechanic told me that my bushings, ball-joint are already worned out and needing replacement..