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 finale centers on Ba-reum's desperate quest for atonement, even as he knows he can never truly be forgiven by his victims' families. Watch Mouse S01E20 210519 720p-NEXT 1
Ba-reum chooses to enact justice on his own terms by killing his father, Han Seo-joon, in prison—fulfilling Detective Go Moo-chi's long-standing wish for revenge. Redemption and Death Ba-reum discovers that he is the biological son
In a moving final sequence, a dying Ba-reum has a vision of himself as a young boy (Jae-hoon) in a church. He tells his younger self that he is "no longer a monster," finally finding a small measure of spiritual peace before passing away. Legacy of the "Mouse" Experiment Redemption and Death In a moving final sequence,
In a twist of poetic justice, the very brain surgery intended to save Ba-reum's life becomes his greatest torment. By transplanting parts of the empathetic Sung Yo-han's brain into his own, Ba-reum is forced to feel the visceral pain and guilt of his previous murders.
Ba-reum is sentenced to death and spends his final days in extreme physical and emotional agony.
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.