What is bidaai 120?

As an AI language model, I do not have specific information about any TV show episodes beyond the internet records. However, I can describe some more general information about the TV show 'Bidaai.'

'Bidaai' is an Indian television drama series that was aired on STAR Plus between 2007 to 2010. It was produced by Rajan Shahi under the production house banner of Director's Kut Productions. It starred Sara Khan and Parul Chauhan in the lead roles of two sisters, who belong to a middle-class family and have distinct personalities. The show explores various social and cultural issues, including love, family values, and relationships. It gained high TRP ratings and became one of the most successful television shows of that time.

As for episode 120, it is impossible to determine specific details of an episode without a brief summary or title of the episode.