The Lanshiang Incident in 2013 was the breaking point for Leon’s old self. Watching the chaos orchestrated by Simmons and the fake Ada (Carla Radames) forced Leon to see the truth: the real Ada Wong did not need a savior. She was a predator, a survivor, and his obsession was a tactical liability.

• The Farewell to Helena: After clearing Helena Harper’s name and ensuring justice for her sister, Leon walked away from China with his integrity intact. He stopped being the man who let a ghost ruin his mission.
• The Secret Pact: Months later, Leon tracked down the real Ada. There was no chasing, no flirting with death—just a conversation between two people who had lost everything to this war. They realized they were each other’s only equals. They entered into a secret union, a marriage built on deep-cover trust. Ada became Leon's ultimate asset, a double agent feeding him the world's most dangerous secrets while appearing to serve the highest bidders.

| Year | Phase | Operational Status | | :--- | :--- | :--- | | 2021 | The Village | Ada infiltrates Victor Gideon’s circle. She provides Leon the intel that triggers the DSO and Hound Wolf Squad's move on Romania. | | 2022–2025| The Quiet Years | Leon and Ada operate a "Shadow Network." Leon mentors a struggling Sherry Birkin as her health begins to fluctuate. | | Early 2026 | The Symptom | A mysterious, lethal illness begins targeting Raccoon City survivors. Leon and Sherry both test positive for the "Ghost Strain." | | Oct 2026 | The Investigation | Four survivors die within weeks. Leon is deployed to Wrenwood, the city neighboring the Raccoon ruins. |

In October 2026, the DSO initiated a desperate investigation into a targeted biological attack. This wasn't a viral outbreak of monsters; it was a "delayed-action" illness specifically affecting those who carried remnants of the 1998 Raccoon City viral exposure.

The Survivors' Syndrome.

Leon and Sherry Birkin have become victims of the very thing they survived. For Sherry, the G-Virus remnants are destabilizing; for Leon, the strain is attacking his cellular structure. Because of her physical decline, Sherry has been relegated to FOS (Field Operations Support), acting as Leon’s tactical eyes from a secure location.

Leon isn't alone. Claire Redfield, the new leader of TerraSave was suffering from the same symptoms, has joined the Leon's efforts. Working with intelligence gathered by Helena Harper and Ark Thompson, the team has identified a prime suspect: Victor Gideon, a former Umbrella scientist with a grudge against those who outlived his "masterpiece."

Leon stood in a rain-slicked alley in Elbridge, a district within Wrenwood. The air here felt wrong—it tasted like the copper of the 1998 RPD precinct. He had just confirmed the 6th victim: a former Raccoon City survivor found dead near the railway, their body showing the same necrotic cellular collapse as the others.

Leon headed back to a small, darkened DSO hideout on the outskirts of the city. As he pushed the door open, the light of a single lamp cut through the shadows. Claire Redfield was there, checking the action on her sidearm. Her face was pale, but her eyes held that same fire from the RPD parking garage. Leon smiled as walked over to her.

"It's good to see you back in action Claire, was starting to think you got to use to being behind the desk."