If you were to sign a contract halfway through writing a novel, but you did not sign a contract, you could continue writing the novel, but you had to pay attention to the copyright regulations of the website. If you have already decided to sign the contract, you need to abide by the terms of the contract and create according to the specified content. If you don't decide to sign a contract, you can stop writing at any time, but you may face the risk of the website deleting your work.