Student or Learner
I will come to your life.
I will come in your life.
Would you please tell me whether both are correct?
Neither is correct. If I have understood what you are trying to say correctly, I would use "I will come into your life." It would be a rather strange thing to say to someone. If you are talking to them and saying something like that, you have already come into their life.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.