Billu The Killer..

I always thought it was Billu. Arohi and him were the only people who knew Arjun's plan to kill KSA. I figured that Billu might kill KSA in order to protect Arjun from going to jail since Arjun took care of him from a very young age. However him not speaking up is very confusing. Maybe there's another twist.

What do you guys think?
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Thanks.

i guess he did that to protect arjun from becoming a criminal again. he did that because he knew that arjun was gonna kill KSA otherwise, and Billu shot him for Arjun!!!!!

Good theory Billu probably did it to save Arjun!