In order to save his brother, Lin Jianguo sent himself to prison.
Pipes, blueprints, tattoos - he devised the perfect escape plan. But the plan couldn't keep up with the changes. A paranoid lunatic saw through everything and insisted on becoming his "backup."
Three calculations are safe. The madman clings to his engineer's instincts.
Brotherly love VS the institutional cage. When sacrifice becomes the only way out, who can get out alive?
