As an external person does your question raises simply more questions which makes answering impossible. For example is it always “/Movie” like in your text or is it actually “/movie” like in your example? Is it always exactly that word or could be be any? Is it always the first word or could it be also the second, third, …? What happens if there are multiple ones with a slash in front of it, should it remove all of them or only the first one? What if there is a space between the slash and the word? …?
Making now a lot of assumptions like that the slash does actually not matter at all and all you want to do is simply always remove the very first word, the code would look like this:
'/movie asuran'.split(' ').slice(1).join(' ')
(This answer was written before the question got updated)