DUO by RICHARD YONGJAE O'NEILL has sold 2,060 copies in Korea.
DUO certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Korea |
2,060 | RIAK / Gaon charts |
Korea Sales: 2,060
Certification / note: RIAK / Gaon charts
Certification Date / sales as of:
|
|
| Total sales | 2,060 | (in 1 country) |
Total
Sales: 2,060
(in 1 country)
|
Year-end chart performance for DUO
| Chart 2018 | Rank | Sales |
| South Korean International Albums (Gaon) |
24 | 2,060 |