Hi!

I took out the front drum pad/noise protector and there is a hole on the right and left side of the threshold. Why is this?
It's as if it's bad, the water flows in there.

I would suspect it allows water to flow out rather than in. Is it not a drain hole?

i don't know, but for example, I don't have a sunroof from which it could flow.

Not quite picturing where it is but could it not be the drain holes for the scuttle?

I'd say it does look like that pour a bit of water over windscreen...