Yoochun and Hwang Hana will be called in together.
The police have revealed that the pair will be investigated at the same time so they can better figure out who is telling the truth. So far, Yoochun has claimed that he did not know the package that he delivered to Hwang Hana were drugs, while Hwang Hana is accusing him of doing the drugs with her. In many cases during a cross-examination that happens simultaneously, the lying side will confess.
Currently, the police are considering whether or not to investigate Hwang Hana one more time before calling them in together. If they are called in together, then the cross-examination will happen mid-week.