First of all, it shows that the cat really likes you. The reason may be because when you were young, you sometimes used your hand or body to tease it, and it regarded your body as a toy to play with; It is also possible that the cat was raised too young (for example, less than 2 months old) and has not been socialized well enough to learn how hard to play with its companions.
Many people like to scold and chase the cat away, but most of them are not very effective, and the cat will always come to annoy you more. The reason is that he takes your scolding and chasing him away as interacting with him, which encourages him to keep biting you.