After being imprisoned for many years, Yerol decides to change his life and live like a human after being released. So he visits his old friends, but there is no one to trust him except a stranger he has been corresponding with through letters while in prison. Although everything was good after meeting that woman, one thing always bothered him: his promise to his mother to be a good person. However, his dream of becoming a human and returning to his mother was not liked by his prison colleagues.