Watch Mouse S01e20 210519 720p-next 1 Now 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. 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. Watch Mouse S01E20 210519 720p-NEXT 1 Watch the dramatic moment when Ba-reum's past finally catches up with him: The finale centers on Ba-reum's desperate quest for 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 Watch the dramatic moment when Ba-reum's past finally 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