Well , we know that Mohan is sincere and that Addu was kidnapped and had turned bad on his own volition. The only way for Megha to realize the true picture would be if Addu tries to kidnap Rimjhim and Megha gets to know and is in some way instrumental in saving her. In the process the evil identity of Addu is revealed to her and she also gets to see that Mohan loves RJ ever so deeply despite not being her biological father. Hopefully that would kill the 'sautela baap hamesha sautela hota hai' syndrome in her mind for ever and she will also realize that Addu was kidnapped and did not run away from Mohan who actually spent 12 years searching for him. I think she would seek Mohan's forgiveness for misjudging him so badly. However, it would be very tough for Megha to accept that her Addu turned bad of his own choice and extricating him from Daddaji's clutches could be the next track.
I really do think Mohan's integrity needs to be cleared in Megha's eyes as early as possible. Can't have good trps for a show where the female lead keeps hating the male lead - 4 months of misunderstandings and hatred is long enough.