Thank everyone for the replies.
Quite confirm it's 4 terminal shunt resistor. Since the value is too small, my cheap Heles DMM cant read the resistance, but my Keysight DMM can read 0.05 ohm on the legs of this component.
@Berni, hey thanks to spot the discoloring on the PQ16 area. I tried to look for any faulty component but cant find crack or burning components. The laptop power adapter look over loaded and the internal fuse is cut off when plugged. There is no short on + and - terminal, it simply over loaded. Only this PQ16 that's suspiciously faulty
Unfortunately somehow no marking on PQ16 and PQ15 IC, are you able to guess what are these ic? The pcb model ms-16h21 doesnt seems available on internet