Correct... so if you paid NT$30,000 for the ticket then the refund would be NT$24,000.

Two ways to find it...

Easiest is to go to the EVA website and enter in a random date but the same destination and if the basic economy appears then it'll show the fees upon clicking the show fare comparison button.



The other way is more complex but shows more details via the ITA Matrix
https://matrix.itasoftware.com/

You need to enter in the same destination but again pick a random date.

Below the destination box you need to select "advanced control"
This will make two new boxes appear.
Routing control and extension codes

In the routing code you want to put "C:BR" (without quotation marks)... that's the carrier you want to search with BR being EVA's code.
In the extension codes you want to put "F bc=S" (without quotation marks)... thats the Fare Booking class (BC) with S being the fare class you want to search.


Then put in a random date and hit search... it should come up with one flight result something like this

If it does not then try a different date as it could mean either S class is sold out or there is no EVA flight on that date.

Upon clicking on the price (in orange) you get a full fare breakdown


Clicking on the rules section will show the full fare rules... just make sure you're looking at the Economy S fare rules (should show it above the blue box)
In the fare rules you'd be looking for "Category 16: Penalties".