The series finale of the South Korean thriller Mouse (Episode 20), which aired on May 19, 2021, delivers a haunting conclusion to the "nature vs. nurture" debate that defined the series. This episode marks the final transformation of Jeong Ba-reum (Lee Seung-gi) from a cold-blooded predator into a man utterly consumed by the weight of his own conscience. The Ultimate Punishment: Empathy
Ba-reum discovers that he is the biological son of the "Head Hunter," Han Seo-joon, and that his life was a meticulously controlled experiment by the OZ organization .
The government official behind OZ, Choi Young-shin, is arrested, and the controversial bill to abort fetuses with the "psychopath gene" is ultimately rejected, emphasizing that one's genes do not have to dictate their fate.