I always expected that it would open around 40cr, not a record opening.
But the songs haven't made big impact and apparently it's not a great movie. So I expect that it will go below 40cr, which would indeed be disappointing. It should have been at 50cr.
And actually Joker doesn't have that much to do with it. If the marketing was done better, it would have opened 40cr+ regardless of Joker or Sye Ra.