Secret Day Slim Heart Medium sanitary pads are good.

These are the Secret Day Black sanitary pads that I have been using consistently. I bought a large quantity at a low price on Gmarket.

The Secret Day line is affordable, but the functionality is actually quite good. It is a medium size, which is on the larger side, and it absorbs well.

I've been using only this. It's fine even on heavy flow days as long as I change it frequently, and I like that it doesn't smell.