When the twisted knot of a plot is finally unraveled, Leon learns that the Chinese government had nothing to do with the various attacks. It was, in fact, Secretary Wilson himself who orchestrated everything.
Wilson's scheme can be traced all the way back to the Penamstan Civil War and hinges on his investment in an inhibitor that dampens the effects of the T-Virus, meaning that subjects who are infected can experience the strength and endurance-boosting properties without fully mutating into zombies or other bioweapons. In trying to implicate China in the various attacks, Wilson was attempting to instigate a war. The US would be able to use Penamstan, which shares a border with China, as a base of operations. Meanwhile, Wilson's inhibitor-honed bioweapons would be deployed to great success and great profit. Once the virus spreads, civilians would also be clamoring to get their hands on the inhibitors to stave off fatal infection.
During much of the season, Leon worked with Jason (Ray Chase) and Shen May (Jona Xiao), two former soldiers who were stationed in Penamstan during the civil war. As it turns out, both of them were tangled up in Wilson's schemes long before the events of the series. Jason and his squad — the mysterious suicides of which Claire investigated — were infected with the virus during their time in Penamstan and Wilson has been extorting Jason into doing his bidding by threatening to withhold the lifesaving inhibitors from him.
While Leon believes his partners are helping him get to the bottom of the attack on the White House, Jason and Shen May have actually been working on their own plan to expose Wilson and wake the world up to what has actually been going on.
Unfortunately, nothing that noble is ever easy.
