After 15 days on top of Netflix's most popular TV program rankings, South Korea's zombie apocalypse thriller "All of Us Are Dead" has fallen to second place in the rankings.

According to statistics supplied by streaming analytics firm FlixPatrol on Sunday, the American drama "Inventing Anna" took over the top spot on its daily ranking of the most-watched Netflix TV series, knocking "All of Us Are Dead" down a rung from its previous position.

Since its initial entry on Jan. 29, the day following its premiere, the Korean-language Netflix original has remained at the top of the charts for a total of 15 consecutive days.

"All of Us Are Dead," which is based on a famous webtoon, takes place in a high school that has been thrown into turmoil by a mysterious zombie virus. A group of kids engages in all-out combat against the zombies, who were once their friends and instructors, with no assistance from the police or other adults present to save them.