mahi knows mithra plan before.... as a intern doctor... kavya was posted for many night shifts... only some times... vidya was with her... on that time.... one nurse came to kavya and asked her to take a pill to not get sleep. kavya done the thing and they took her to a demonstration room and started doing psycho therapy... she was giving to a healthy human... for minutes.... kavya acted as a schizophrenia patient and doing some psychotic things... then they slowly started showing mahi photo and hallucinated her. she responsed as a he is a stranger..... by observing this vidya was stunned and recorded it. she slowly changed that serum to saline water and slowly kavya got unconscious... they all left that place..... kavya carried her to ward and took her blood samples. later she send that video to mahi... by seeing that video mahi was terrified and asked her samples to send there.... by private jet vidya sent to mahi by person and by seeing results ... mahi was shocked. that dangerous drug... which was prepared by mahi's professor willard's . he showed those results to his professor. recently ... his lab was robbed and got some valuable things robbed. those drugs were his professor's effort. how it went to mithra... to challenge it.... he has play a story to fix mithra and to chase that thief. mahi sent back vidya to take care of kavya and started to do reearch on kavya symptoms... this symptoms was similar to professor's thesis. he didnot get who the idiot done this.... so he first placed his thesis on kavya disorder. then he slowly started investigations... he wanted to cure her disease.... so he didnt want to tell his professor. this was his personal issue. so he wants to clear this issue. but he informed this to professor only robing thing. to cure these 3 antidotes have to be given . symptoms are in primary stage..... previously she had a psychological issue. so primarily symptoms are cured .... then antidotes are given.... so professor asked mahi to prepare antidote. he took it as a challenge... with professor's help.... mahi created two antidotes.... 3 rd antidote has to done late and it is only done by his professor so... he prepared and kept it in a safe. and lock was known only for two.... that is mahi and professor. with professor coordination mahi prepared antidotes and kept it for lab results.