CJ who?

Does anybody know who is this CJ and out of the blue how he came into the show? Also what is his problem with Jasssi?
If he is the one whom Purab called to help Jassi then why does he hate her?
Even if Purab was disappointed with Jassi, he always had her best interest in mind, and you would think his friend would understand this and not have complete opposite opinion of her. Also, if CJ is connected with underworld (we later find out), then why is he friends with Purab who is always portrayed as Mr. Goody 2 Shoes?
This CJ is a big mystery to me?

CJ was one confused evil soul 😡 😕 😆 ..Because of this guy only Armaan and Jassi marriage never happened 😡 🤢

Actually Purab had sent CJ to save Jassi from Armaan 😕 ..I know it doesn't make any sense 😆 😕

But CJ used to hate Jassi because he thought that Jassi has ditched Purab for Armaan and today because of Jassi only ,Purab is lieing on his death bed 🤢