(SBS)

Network channel SBS said it would not be extending “Scarlet Heart: Ryeo.”

“It is impossible to extend a series that was pre-shot,” a source from SBS was quoted as saying in an OSEN report.

The 20-episode-long period series, which airs on Mondays and Tuesdays, is scheduled to air its final episode on Oct. 31. There has been speculation that SBS might run an extra 21st episode on Nov. 1.

SBS has yet to determine whether the finale will be broadcast on Oct. 31 as initially planned or a week earlier on Oct. 25, with both the 19th and 20th episodes broadcast in a row.

The drama “Romantic Doctor: Teacher Kim,” which is set to take over the “Scarlet Heart: Ryeo” time slot, will premiere on Nov. 7.

By Son Ji-hyoung (json@heraldcorp.com)