Tread looks fine, but tyres appear underinflated.

Inflate to recommended pressure.

You must rotate your tyre in a X pattern. 

Use also your spare tyre (if full size).

Side sticker recommended 220 kpa or 31psi.

I used to pump at 200 due to some advise to pump lower than the recommended spec, thus my old tyres suffered the same fate like this, thus there must be my fault of doing it wrong. Lately I am pumping at 220/230 again when others commented that the car seems to have not enuff air. Asking around, many ppl advised that tyres need to change at the 2-3 years period, but I am not satisfied with the answer due to mine having low mileage (the older tires have almost 35k km in 3 years, so maybe its understandable that its worn out and i never rotate it before).

Thus i posted here to ask for more advise. Having little or no knowledge on tyres is really scary, scared of tyres blown and other horror stories. I did not rotate this tyre cos usually ppl advise to only rotate above 10k km.