Some psychopath undergoes an experimental procedure which “cures” him of his psychopathy. He develops empathy and starts looking at life differently. Probably more of a drama than thriller. Made in the last 15 years, maybe 20, but not earlier.
Another guess:
In this one Sam Worthington’s character undergoes an experiment, and he becomes the good guy, but this is not really a drama, but an action movie:
”Terminator Salvation” (2009)
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