Check The Haunted Palace Episode 7

Synopsis

The water spirit attacks Yeo Ri with a deadly spell. She slowly shows the same symptoms as the Queen, who is bedridden due to an unknown illness. Kang Cheol suggests that the King become bait to catch the water spirit, as it wants the royal blood. Yeo Ri hears the news and rushes to the river where Kang Cheol and the King are waiting for the water spirit to emerge.