devs look alike was named raju.
Kaajjal took raju to the Singh parivaar so he can help her expose karan and ameesha aka devs killers.
gradually as kaajjal and raju worked together raju starts falling in luv with her.
then NT wants them to get married but since kaajjal still luvs dev she says no and keeps on making up excuses. but raju wants to marry her since he luvs her. kaajjal runs away from home after getting into a fight with raju but she later finds out raju is dev. Dev tries to convince kaajjal he is her dev but she dosent believe him, so to prove it dev attempts suicide which makes kaajjal believe it. they both are ready to get married but karan makes kaajjal think that raju is lying and is on karans and ameeshas side. on the day of their wedding kaajjal leaves the mandap and tells NT that dev is raju rangeela and that karan and ameesha have killed dev. NT gets mad and wants to throw dev out of the house thinking hes raju but karan puts a marble on the stairs which causes her to slip and die. Raju proves himself to be Dev by donating blood to NT because Dev is the only family member with the same blood group. that makes Kaajjal believe Raju is Dev and she feels she made a mistake. but NT dies and Dev holds kaajjal responsible for NTs death and starts to hate her because he dosent know what karan did. Kaajjal becomes a devdasi and starts to leave town but she looses her memory and meets aditya. Kaajjal starts to think aditya is her husband and aditya has to fake that they are married. During this period Dev finds out karan is responsible for NTs death and goes off to search for kaajjal. Thats where he meets Soniya, Aditya's sister. With the help of Soniya, Dev finds Kaajjal. but since Kaajjal lost her memory she dosent remember dev and she says shes married to aditya. But Adityas mom comes into town so Kaajjal and Dev have to act like they are married. but Aditya like an idiot thinks him and kaajjal are seriously married and starts becoming overpossesive. Kaajjal is slowly returning her memory. Hopefully next week she gets it back.
Hope this helps 😃