Taehwa receives a lung transplant from his father, who had committed a hit-and-run the night before the surgery. Riddled with guilt, Taehwa sets out to find the victim’s daughter Miji现在的我,每天都在自责和悔恨中度过。我恨自己的无能,恨自己的懦弱。如果时光可以倒流,如果我可以勇敢一点,如果……可是,这个世界没有如果。