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 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 Watch Mouse S01E20 210519 720p-NEXT 1
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. The series finale of the South Korean thriller
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 Ultimate Punishment: Empathy Ba-reum chooses to enact
He eventually visits Ba-reum’s unmarked grave, suggesting a complex form of closure and a sliver of forgiveness for the man who was both his partner and his enemy.
Although she cannot forgive Ba-reum for killing her grandmother, she chooses to live her life as a survivor rather than a victim.
The episode also resolves the fates of the supporting cast and the societal impact of the OZ organization's actions: