Karan
Karan's character feels a little confusing sometimes. Even though he is angry with Tulsi and doesn't like her, he still follows the values and sanskars she taught the family. That's why he was against Gautam's plan to sell liquor in Baa's mansion.
This shows that while he may hate Tulsi personally, he still believes in the principles she stands for. Also I feel it's valid also because karan has no idea of parth being such an asshole
But nandini should have revealed it before leap as karan is sensible he would have listened and understood