y mihir cud hv done it..

if its mihir who has done d accident, it may b dat him doing d accident might not hv anything to do wid raman.. but maybe wid mihika's family/the iyers! maybe someone from mihika's family might hv killed his parents( shagun's family has never been shown!) so he wants to take revenge or smthng..he got close to mihika for d same reason.. smthing like dat..!!