Regarding the similarity in characters of Arnav, Khushi and Anjali, then I can only say that I haven't introduced the complete concept of their characters. In my story, Arnav will be someone who can love to extreme and who can hate to extreme, his character and emotions will be so confusing. Khushi will be strong in her own way. She will be a person who will have many shades. You will think of her to be rude, at the same time you will love her. She will be fighter and a survivor. And Anjali's character will initially have a touch of the Anjali from the serial who will be loving and soft but then she will become strong and courageous. She will be the biggest support of Khushi.
See for now I can only reveal this much. I thought that I will post the next chapter soon so that you can understand the difference in the plot. But since I am a little busy with my college work, I don't know when I will be posting it next. That's the reason I didn't reply for your comments earlier. I hoped you would understand on your own after reading the chapter. Now I am clarifying it to you. Please understand, it's not at all a copy of your story. If you still feel that I copied, then I am apologizing from the bottom of my heart. I will try to update the next part soon and clarify the difference between the plots. Till then please understand.