I'm not in Indonesia. I understand you have a very tight budget. The problem with a cheap PSU is that it can fail and damage other components when it fails.
A safe PSU protects your computer, and more importantly all the money you spent on the computer.
For your computer, you do not need a very powerful PSU. Brand does not matter so much. What is most important is the warranty period. It should be a minimum of 3 years, but if you can afford a 5 year warranty PSU then buy that.
The warranty tells you a lot about the quality and reliability of the PSU.
Another important feature is overload protection. Cheap PSUs often lack protection.
Can you increase your budget to 800k? I have seen a Cooler Master Psu Mwe Bronze 550 V2 for that price. It would be probably the best you can afford, if you can afford it.
Other possible choices:
Corsair Cv Series Cv450 (700k)
MSI Mag A550Bn (700k)
Stay away from Gamemax, Enlight and Aerocool models and anything no brand.
I mostly looked at the prices on this store:
https://iprice.co.id/enlight/komputer/perangkat-keras/pencatu-daya/?show-filter=1&sort=price.net_asc
A lot of the cheap models are very unreliable. I hope you can afford a better PSU. Maybe you get lucky and find one for a reduced price.
Best of luck.