Naira didn't think about whether she would get justice, whether Goenkas would believe her. She cared for Karthik, what he must be going through having his sister and her husband on one side and his love on the other. When Naksh was asked to apologize, she immediately disagreed, not once thinking about what would happen to her marriage, would it suffer, she thought of nothing, only that her brother was right.
Naksh knew he was right, but he apologized, for both Naira and Karthik, because for him their happiness was more important than what was right and wrong.
Karthik came to SH sided Naira in her words that Naksh had made no mistakes and wouldn't be the one apologizing. And when Naksh apologized for no fault of his, Karthik did the same, showing the equality in their relation. Both end the whole thing with a brotherly hug.
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