South Korean police are preparing for 'worst-case scenarios' ahead of the Constitutional Court's ruling on the impeachment of President Yoon Suk Yeol. Subway stations and a school will be closed for safety reasons, and police will be out in force. The ruling is expected to come this week, and both supporters and opponents of Yoon are expected to gather in large numbers. The National Police Agency is setting up plans to handle potential violence, including the use of pepper spray or batons. A subway station near the court will be closed on the day of the ruling, and trains may not stop at other stations with anticipated large rallies.