Who is The Real Culprit?

Jassi realizes that Armaan is playing tricks with her. The girl gang also tries to notify her about this. She confronts Armaan and charges him for all the mess, but he remains quiet. Purushottam Suri calls for an urgent board meeting regarding Gulmohar's draft cheque, which goes missing. Jassi accuses Armaan at first but eavesdrops Viru exposing the real culprit's name to the girl gang and apprehends that Armaan is not at fault. Who is the culprit then?