If I start reading the novel from ch 29, like the webtoon's says, will it be confusing? Li...

No. It’s not exactly the same but you won’t be lost, I guarantee you

Nope. They adapted it quite faithfully and we’re still in the beginning of 3rd scenario. So even if you jump to ch29, you’ll miss nothing big.
You might want to start from ch28 novel, it’s the first chapter of Landlord arc.

Thank youu