Since Lu Ming did not succeed in getting back with Du Ling, the man hardened his resolve and chose to set him up instead.
After all, if something happened to Du Ling, the so-called hope of humanity would be lost and everyone would have to depend on Du Jian once more. The samples that had been collected were not near enough to actually vaccinate everyone.
With the state of the world, a lot of lab equipment had been destroyed or were unable to be operated hence certain chemicals were no longer available. Mass producing the vaccine was hereby impossible for now.
Although Du Jian was missing, Lu Ming was sure that if Du Ling was out of the way, Du Jian would willingly reveal himself and be automatically returned to his former status as the hope of humanity.