Ziddi Dil Maane Na S01 E106 A Special Card For Sanjana

In this episode, Sanjana is worried that she has said hurtful things to Kundan in anger and he may call her parents to inform this. Sanjana then remembers her hurtful words said to Kundan. Sanjana then receives a card that said “I’m sorry”. The card has special messages written asking for forgivenes.Who has sent this card?