Does this manhwa adapted from a novel??

Yes. Here is a link: https://mavintranslations.com/series/s-class-hunter-heals-with-monsters-novel

Hi. I was trying to buy the advance chapters but coin payment is not working not help/support/discord. U have other link or way to contacf them?

Sorry, I don't have another link or a way to contact them. My apologies.