Thanks Pearl for the nice update.
The way Mohan behaved shows what is needed when someone is in love. He showed courage and he stood up to his gutter mom and told his position honestly. The way he behaved indicates he deserves to marry Kalyani and a quickly arranged marriage is definite to happen for them. Kalyani's marriage will also be arranged in the same way as is the case of her friends.
The way he behaved is in striking contrast to how TA behaved earlier. TA could not speak about his love to Charu and could not stand up to the emotional blackmail his gutter mom put up. Thus in one way he let the desire grow in the mind of Charu and his mom. And because of his lack of courage and indecisive behavior, Thulasi also found herself in problems.