Where can I read the novel?

Tappytoons has started translating it in english this year. If you get the app, you can unlock chapters for free if you patiently watch ads.

The novel forum also has the link to the official korean novel along with a guide on how to MTL.

Which novel forum? Can I get the link? And what's MTL?

https://www.novelupdatesforum.com/threads/this-marriage-is-bound-to-fail-anyway-%EC%9D%B4-%EA%B2%B0%ED%98%BC%EC%9D%80-%EC%96%B4%EC%B0%A8%ED%94%BC-%EB%A7%9D%ED%95%98%EA%B2%8C-%EB%90%98%EC%96%B4%EC%9E%88%EB%8B%A4-this-marriage-is-bound-to-sink.126106/

MTL basically refers to machine translation such as google translate. When it comes to korean, it can be quite difficult to get a clear MTL so people have recommended ways to get the most reliable.

Thank you so much!ヾ(☆▽☆)