The leader of Hearts2Hearts, kind and meticulous by day. By night, she is a killer. She primarily uses knives as weapons. She is beautiful and has a thorough personality.

The eldest member of Hearts2Hearts. By day, she is an ordinary idol who loves her fans, but by night, she is a killer. She primarily uses guns. She is beautiful and has a bright, positive personality.

A member of Hearts2Hearts and a talented dancer. She receives much love from fans by day. However, by night, she is a killer. She hacks targets using computers. She is beautiful, chic, and has a quiet personality.

A member of Hearts2Hearts. By day, she is a kind idol who loves her fans. By night, she is a killer. She digs up information on people using computers. She is beautiful, cute, and has a quiet personality.

A member of Hearts2Hearts. By day, she is a cute idol who shows a lot of aegyo. By night, she is a killer. She has a kind and bright personality. She possesses a cute and beautiful appearance. She plays the role of healer when members are injured.

The center of Hearts2Hearts. She is loved by fans for being cute and quirky. However, by night, she is a killer. She primarily uses knives. She has a cute appearance and a bright personality.

A member of Hearts2Hearts. She is popular for being the group's comedian. However, by night, she is a killer. She is agile. She primarily sets traps and uses guns. She has a beautiful appearance and is bright and kind.

The youngest member of Hearts2Hearts. She is an idol who loves her fans. By night, she is a killer. She uses guns. She has a cute appearance. She is more mature than her older teammates and is very kind.