- Korean Name:
- 豆原 一成
- Native Name:
- Mamehara Issei
- Group:
- JO1
- Position:
- Center
- Birthday:
- May 20, 2002 (24 years old) All JO1 member ages
- Height:
- 173 (5ft 8in) All JO1 member heights
- Stan Rank:
- 206th
- MBTI:
- ESFP
- Origin:
- Maniwa Okayama, Japan,
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