By the end of Nagamandala, Appanna undergoes a significant transformation.
Initially, he is cold, indifferent, and neglectful toward Rani, treating her as a mere domestic servant rather than as a wife.
However, upon learning about Rani's emotional connection with the snake-man (and her infidelity, in a sense), Appanna experiences a shift in his character.
Instead of remaining emotionally distant, he becomes more understanding and begins to engage with Rani on a deeper emotional level.
This change allows Rani to reconcile her feelings for both Appanna and the snake-man, and it marks a turning point in their relationship.