which episode?

hey guys! i need a little help, I was wondering if anyone knows which episode does this scene belogn to:

it is 3:20 into the song, where kt and lakshya are eating cake...

http://youtube.com/watch?v=6k6zqEcyxTg&mode=related& search=

anything will help, I just need to figure out what month it belongs to and i can look it up in the archives...thanks!😊

-jhanvi