Question: Which performer on the EP "Twinkle" also performed on the Korean stage musical version of "Mamma Mia"?
Sentence (from "Seohyun"): Apart from her group's activities, she has established herself as an actress, notably through her participation in the original and Korean versions of stage musicals including "Moon Embracing the Sun", "Gone with the Wind" and "Mamma Mia".
Relevant evidence: Yes