A Justice Ministry official revealed to STAR News that "after an unexpected urine test on Han Seo Hee that came back positive, she has been confirmed to be in custody at a related facility."
The official also revealed, "the probation office has applied to the court to cancel Han Seo Hee's suspended sentence. The action will be taken in accordance with the court's decision."
In September 2017, Han Seo Hee was sentenced to a suspended three year prison sentence for four years probation for smoking marijuana with Big Bang TOP.
Han Seo Hee since then made her Instagram private.
sources: dailynaver, STAR news