Which font are you using? Try using Deja Vu?
Awesome. M Sung and AE Furat might also work if you want to experiment.
In order not to start a new topic I will write here. I have a problem with links in the ebook, it turns them off and they are not “clicked”. Do you have a solution? Sorry for my bad English 😉
Your English is fine; no problem. If your links disappear after the PDF is parsed into memory by TCPDI and then re-written (with a mark) by TCPDF, it is because TCPDI/TCPDF do not recognize your PDF syntax. This is unfortunately common because countless applications claim to write PDFs but do not use correct PDF syntax. The parsing/writing of PDFs is done by 3rd party open source libraries included with WaterWoo — NOT by WaterWoo itself. So, either correct your PDF syntax (sometimes transparent layers OVER the link interfere, for example, you might find more advice in the WaterWoo Premium documentation at web.little-package.com) or take up the issue with the authors of TCPDI and/or TCPDF.