Kundali Bhagya written update, February 20, 2019: Preeta gets ready to expose Monisha

In the latest episode of Kundali Bhagya, Janki sees Prithvi dragging the box in which he has hidden Billa and starts questioning him. Prithvi lies to her saying that he is also a part of the Luthra family and wants to help. Janki still doubts his intentions. Prithvi decides to keep the box aside and says that he will later take it away. Prithvi wants Janki to leave and fears if Billa gets conscious he will expose her.
Janki sees Kareena bua and Mahesh discuss that Sameer is not agreeing to act as Ritwik. Sameer tells everyone that he will stop Karan and Monisha's wedding. Rishabh takes Sameer to the room and tells him that they will have to make a proper plan to stop the wedding.
Everyone gathers in a room and Preeta tells Sameer that he needs to ask Monisha in Ritwik’s voice if Karan molested her?
Sameer worries that Monisha will catch him as his face will be seen. But Preeta tells him that there will be darkness in the room and Monisha won't be able to see his face. She tells Srishty to fit the night cameras in Monisha’s room so that they can record her confession.
Janki stands near Prithvi. He gets irritated to see her standing beside him. Janki asks Sarla about Prithvi's relationship with Preeta. Janki tells Sarla to ask Preeta if she likes someone else.
Karan reaches the mandap. Prithvi tells Sarla and Janki to go near the mandap as the wedding function has started. Kareena bua and others tell Karan not to worry about the wedding. Dadi takes Mahesh aside and tells him about their plan. Monisha dresses like a bride and sits beside Karan.
Janki blames Monisha for ruining everyone's life. Monisha gets angry at her. Luthra's get tensed as they feel that Janki might ruin their plan. Dadi informs Janki about Preeta's plan and she apologizes to Monisha for shouting at her.