A woman reports that she killed her husband and identifies the place where she dumped the body, but the corpse has vanished without a trace. DNA from an unidentified body reveals a parent-child relationship with a street thug, while the man's legal son is a brilliant doctor with a bright future. The underachiever grows up to become a police officer, while the teacher's model student becomes a suspect in a case. As he searches for the truth, he gradually sees through the seemingly bright but thorn-filled life of the top student. What kind of person will someone become if they grow up under constant pressure, exploited and surrounded by violence? If someone has no protection, no one to rely on, and not even a skill to their name, do they deserve to be stuck at the bottom of society? Parents don't need to pass an exam to have children. If you've been dealt the worst hand, is there any bright way out besides going down in flames together?