Miley Jab Hum Tum S04 E19 Nupur Asks Mayank to Apologise

Sheena plans to use the pool party to permanently draw a wedge between Samrat and Gunjan. Meanwhile, Nupur asks Mayank to apologise to her. Mayank says that he has done it once already, and now it's up to her to forgive him. What is Sheena planning against Gunjan?