I'll go out on a limb and hazard a crazy guess: Hana's gonna go berserk when he goes three days without the serum. And he'll kill Murasaki in that state. Dr Heo and his crew will shake Dr Long's henchmen off, but arrive too late to save her. Then Dr Heo and Hana will go into hiding, with Dr Heo being able to prepare the serum for the boy periodically.
This is how crazy I think Wanan can get. Let's see.