The Choice of Death

Death is an eventuality that life doesn't provide people an option with; but what if a person runs into the fallacy of outrunning the nature in the race towards death and chooses it on his own accord?
Aadil, a commercial pilot, is one who finds no meaning in existence and questions it, while Alia, an Air Traffic Controller is one who loves life the way it unfolds for her. Achudev, an assassin, on the other hand, is one who found meanings for the events in his life through his struggle, though his meanings aren't ones the normal society would accept.
Aadil and Alia are both in love and in spite of the happy relationship he is in, Aadil due to his existential crisis decides to end his life and hires Achudev for the same, giving himself 90 days to explore life with the clock running against him. As Aadil's views about life start to change in the period, an unexpected turn of events gives him a purpose, a purpose larger than his life and much larger than his planned death. What is it and does Aadil's' perspective about life change?