Question: On which channel did a television series air in 2015 that starred the main vocalist of the South Korean girl group Apink?
Sentence (from "Cheer Up! (TV series)"): Sassy, Go Go") is a 2015 South Korean television series starring Jung Eun-ji, Lee Won-keun, Cha Hak-yeon, Ji Soo and Chae Soo-bin.
Relevant evidence: Yes