When did he come up with the conning scheme?

When did he come up with the conning scheme? - Silhouette of Man

In the Spanish 2016 movie Secuestro (spoilers ahead), the protagonist's (a female lawyer) ex-lover conned her into paying a huge ransom for the alleged participation in killing a man the protagonist suspects to be her son's kidnapper.

What I didn't get from watching it is if her ex-husband planned everything from the very beginning, or came up with the plan only after the lawyer asked him for a help: when exactly did the woman's ex-lover come up with his conning scheme?






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When did he come up with the conning scheme? - Woman Wearing Black Bra and White Tank Top Raising Both Hands on Top
When did he come up with the conning scheme? - Selective Close Up Photography of Brow Dog Looking Up
When did he come up with the conning scheme? - A Woman Lying on Blanket Pointing her Finger Up





I've got a plan so cunning...




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Sebastiaan Stam, Tirachard Kumtanom, Simon Robben, KoolShooters