so I am not able to find the logical way how Rachna would switch back to Rajeev.
Rajeev has feelings for her that we know from his face expressions and his eyes, but how he would express his love because already he has rejected Rachna twice excusing student -teacher relation(though it is fake reason). so Cv's needs to show very strong reason why Rajeev rejected her though he loved her.
CV's have to think hard how they develop Rachna-Rajeev pair.
because logically they both have closed doors for each other.
so it would be quite interesting to see this track very first time in tv serials history.
Rajeev is most brilliant personality among whole SSLK team so cv's cannot show him as love struck or easily proposing her and Rachna has also her self respect now so CV's cannot show her again proposing him who has rejected her twice, if she would propose again him, then again it is her vulnerability and may be she would be called characterless(don't want to tell her like this but i have to ). because now we expect from her to be more strong and not so easily carried away by someone's little attention.
Rajeev knows that Rachna had feelings for Vihan, but Vihan had rejected her so how Rajeev would re-attract Rachna . Rajeev had to try had to rep-enter in heart of Rachna. It would be quite interesting.
it is a very tough challenge for Cv's themselves to develop this track...
in short: jab miya bibi hi nahi hai razi to kaise karege kaaziđ