karan mehta is from mumbai.i remember it was mention earlier.karan mehta family also at mumbai...so yash wanted to meet karan mehta family and explain the whole scenario to them why paridhi hit him with vase..in earlier episode also mentioned that, karan mehta family wanted the criminal to be punished...so iam 100% sure this journey of yah and arathi is to convince karan mehta family...maybe the story will get more intresting when yash and arathi find out that karan mehta is alive or some CSI wala investigation will take place i guess.