Clara leads an innovative software corporation, but predatory corporate raiders engineer a hostile takeover while her relatives coerce her into an arranged marriage. Her life hangs in the balance when elevator cables snap in the dark tower, plunging her downward. A humble nocturnal security officer named Lucas risks his body to pry open emergency brakes, shielding Clara from impact.
Impressed by his calm bravery and needing an immediate legal spouse to invalidate family marriage clauses, Clara offers Lucas a temporary marital contract. As arrogant business rivals attempt to intimidate Clara, the unassuming guard begins quietly neutralizing threats with lethal efficiency. Clara soon realizes Lucas is actually the legendary defense conglomerate titan thought killed years ago.
