In which field can I go after completing LLB and LLM?

After LL.B., you can do LLM in criminology. After the completion of LLM (Criminal Law) degree, there are career options in the legal field pertaining to both the public and private sectors. Both the sectors hire LL. M. (Criminal Law) degree holders who are professionals with sheer acumen and astute

Both, these courses are related to law. Hence, the field to pursue would be law. The specialization that you opt for will determine the exact designation.