Question: Which of the four members of the South Korean girl group Red Velvet, is both a member and leader?

Context paragraphs:
The Red Summer (EP): The Red Summer is the fifth EP by South Korean girl group Red Velvet.  Marketed as a special "summer" mini-album release, it was released digitally on July 9, 2017 and physically on July 10, 2017 by SM Entertainment and distributed by Genie Music.  The EP includes a total of five tracks, including the title track "Red Flavor".

Irene (singer): Bae Joo-hyun (born March 29, 1991), better known by her stage name Irene, is a South Korean singer, television host and actress.  She is a member and leader of the South Korean girl group Red Velvet.

Wendy (singer): Son Seung-wan (born February 21, 1994), known professionally as Wendy, is a South Korean singer.  She is a member of the South Korean girl group Red Velvet.

The Red (album): The Red is the first studio album by South Korean girl group Red Velvet.  It was released on September 9, 2015 by S.M. Entertainment and distributed by KT Music.

Red Velvet discography: The discography of the South Korean girl group Red Velvet consists of one studio album, five extended plays, and twelve singles. Red Velvet was formed by the Korean entertainment company S.M. Entertainment in 2014, and consists of five members.

Kang Seul-gi: Kang Seul-gi (born February 10, 1994), better known by the mononym Seulgi, is a South Korean singer.  She is a member of South Korean girl group Red Velvet.

Red Velvet (band): Red Velvet (Hangul: 레드벨벳) is a South Korean girl group formed by S.M. Entertainment.  The group debuted on August 1, 2014, with their digital single "Happiness" and with four members: Irene, Seulgi, Wendy and Joy.  In March 2015, Red Velvet added a fifth member, Yeri, to the group.

Ice Cream Cake (EP): Ice Cream Cake is the debut extended play by South Korean girl group Red Velvet.  It marks the first appearance of the group's fifth member, Yeri.  The album was released digitally on March 17, 2015, and was released physically on March 18.  The album was released in two versions and contains six tracks with double title tracks, "Ice Cream Cake" and "Automatic".

Rookie (EP): Rookie is the fourth extended play by South Korean girl group Red Velvet.  It was released on February 1, 2017, by SM Entertainment.  The album contains six tracks, including the single of the same name.

The Velvet: The Velvet is the second mini album by South Korean girl group Red Velvet.  It was released on March 17, 2016, by S.M. Entertainment.

Supporting paragraphs: Red Velvet (band) Irene (singer)
Answer: Irene