All through the LU thread and I know there's going to be a hundred threads saying 'Sanaya and Barun were on holiday that's why we had an Arnav/Khushi free episode' but that's not an excuse.
I'm pretty sure Sanaya and Barun didn't turn up on December 30th and say 'Oh by the way we're taking a break for a couple of days, bye!' The CVs and writers must have known about the vacation in advance and if they had any sense would have been able to plan the episodes and shooting accordingly.
Also if the show in general had any logic left to it we wouldn't be annoyed by scenes of just Akash and Payal and Shyam and Anjali but we would accept them as necessary for the track to move forward. Instead the story is stuck in practically the same place it was on Monday's episode.
Personally I don't buy the 'They were on vacation' excuse, lots of other shows have lead actors that take vacations or even other jobs at the same time and still manage to film bank episodes in advance.
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