Date of Birth: April 21, 1999 Place of Birth: Gangnam-gu, Seoul, South Korea Nationality: Korean The oldest member of TREASURE. Speaks in standard dialect. Called Hyunsukie-hyung or Hyung by other members. Considered the mother figure of TREASURE, but is said to be scary during practice.

Date of Birth: March 14, 2000 Place of Birth: Busan, South Korea Nationality: Korean The father figure of TREASURE. Speaks in standard dialect. Called by his name without honorifics by Hyunsuk, Yoshi, and Junkyu; called Jihoonie-hyung or Hyung by other members.

Date of Birth: May 15, 2000 Place of Birth: Kobe, Hyogo Prefecture, Japan Nationality: Japanese Same age as Jihoon and Junkyu. Speaks with a Kansai drawl. Called by his name without honorifics by Hyunsuk, Jihoon, and Junkyu; called Yoshi-hyung or Hyung by other members.

Date of Birth: September 9, 2000 Place of Birth: Chungju, Chungcheongbuk-do, South Korea Nationality: Korean Same age as Jihoon and Yoshi. Speaks in standard dialect. Called by his name without honorifics by Hyunsuk, Jihoon, and Yoshi; called Junkyu-hyung or Hyung by other members.

Date of Birth: July 23, 2001 Place of Birth: Yongin, Gyeonggi-do, South Korea Nationality: Korean Same age as Asahi. Speaks with a slight Kansai drawl. Called by his name without honorifics by Hyunsuk, Jihoon, Yoshi, Junkyu, and Asahi; called Jaehyukie-hyung by other members.

Date of Birth: August 20, 2001 Place of Birth: Osaka, Osaka Prefecture, Japan Nationality: Japanese Same age as Jaehyuk. Speaks with a Kansai drawl. Called by his name without honorifics by Hyunsuk, Jihoon, Yoshi, Junkyu, and Jaehyuk; called Sahi-hyung or Hyung by other members.

Date of Birth: December 4, 2003 Place of Birth: Gangnam-gu, Seoul, South Korea Nationality: Korean Speaks in standard dialect. Called Doyoungie-hyung or Hyung by Jeongwoo, Haruto, and Junghwan; called by his name without honorifics by other members.

Date of Birth: April 5, 2004 Place of Birth: Fukuoka, Fukuoka Prefecture, Japan Nationality: Japanese Same age as Jeongwoo. Speaks with a Kyushu drawl. Called Ruto-hyung or Hyung by Junghwan; called by his name without honorifics by other members.

Date of Birth: September 28, 2004 Place of Birth: Iksan, Jeollabuk-do, South Korea Nationality: Korean Same age as Haruto. Speaks in standard dialect. Called Jeongwoo-hyung or Hyung by Junghwan; called by his name without honorifics by other members.

Date of Birth: February 18, 2005 Place of Birth: Iksan, Jeollabuk-do, South Korea Nationality: Korean The youngest member (Maknae). Refers to all other members as Hyung.