What was the name used by the singer whose debut mini-album was Walkin' when she appeared as a contestant on "King of Mask Singer"?
Walkin' (EP): Walkin' is the debut mini-album by South Korean singer Suran. Suran (singer): Shin Su-ran (Hangul: 신수란), also known by her stage names Elena (Hangul: 엘에나) and Baily Shoo (Hangul: 베일리 슈), and better known by the mononym Suran (Hangul: 수란), is a South Korean singer-songwriter and record producer. Suran (singer):  In 2017, she has also appeared on MBC's "King of Mask Singer" (episodes 93–94) as a contestant named "Skip to the End, Hello".
"Skip to the End, Hello"