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Episode 1 sets up the dual trajectories of the protagonists—Simón striving for success to secure his future, and Irina pursuing vengeance tied to a devastating past. Their online connection and Irina's invitation to Bilbao launch the suspenseful narrative of love, secrets, and danger.

If Simon doesn't fix LISA in three months, it will be Sanders'. Meanwhile, Irina is looking for her family's killer. All she knows is that they call him The Spider.

Irina's plan to bring down her family's killers is a disaster, but not in vain. Mistrust settles between Boris and the Russian mafia.

Tomás is dead. Or rather, he has been killed. Simon is still in shock, unable to explain how this could have happened, and now he must face the endless interrogation by the police. Although he is one of the suspects, he is not the main one. Since Irina came into his life, a trail of blood has spread to his best friend. What if their destinies didn't cross by chance? Will Tomas's traumatic death open his eyes? What if the person he has fallen in love with is a murderer?

Only 3 months ago, Simon started living in a dream. He got a million-dollar contract to make LISA a reality and Irina came into his life. Today, the dream has turned into a nightmare: both may die. The test to certify whether LISA is a success or a failure is imminent and they have already lost all hope of fixing it. Irina is kidnapped because of her guilt and her chances of survival are even slimmer.

Simon has managed to rescue Irina, but the nightmare is far from over. The scar that was left on Irina's cheek when Boris killed her family has opened up again and the wound is bleeding more than ever. It will only close when one of them dies.