All good things come to an end and new things begin, even if "Tunnel - Drama" likes to mix the "when" part of it up. Jin-woo is arrested and our characters get closure in the present. It is a time of regret, relief and redemption, but also a time of goodbyes as Gwang-ho decides to take one last run through the titular tunnel in hopes of reuniting with his family in his own time.
While I feel the series could have spent more time with Jin-woo's (Kim Min-sang-I) creation as a killer, I do appreciate that we at least discover his perspective. Ho-yeong (Heo Sung-tae) and Jin-woo had a skewed perception of the world and the neglect or even enabling of the ones around them in light of it slowly robbed them of their humanity. I wish Jae-i's (Lee Yoo-young) speech about preventing the creation of victims included preventing the creation of perpetrators.