The election was held only by the votes of the party members. The first round of voting was held from 6 to 11 July 2015. Candidate Roh Hoe-chan and Sim Sang-jung, who won the first and second votes respectively, entered the final vote. The final round of voting was held from 11 to 18 July 2015.
First round (6–11 July) results[1]
| Candidate | On-line vote | Off-line vote | ARS vote | Total votes |
|---|
| Roh Hoe-chan |
2,762 (42.7%) | 31 (32%) | 386 (46.3%) | 3,179 (43%) |
| Sim Sang-jung |
1,985 (30.7%) | 49 (50.5%) | 278 (33.4%) | 2,312 (31.2%) |
| Cho Sung-joo |
1,136 (17.6%) | 10 (10.3%) | 121 (14.5%) | 1,267 (17.1%) |
| Noh Hang-rae |
588 (9.1%) | 7 (7.2%) | 48 (5.8%) | 643 (8.7%) |
| Total |
6,471 | 97 | 833 | 7,401 |
Final round (13–18 July) results[2]
| Candidate | On-line vote | Off-line vote | ARS vote | Total votes |
|---|
| Sim Sang-jung |
3,014 (53.2%) | 42 (79.2%) | 595 (47.9%) | 3,651 (52.5%) |
| Roh Hoe-chan |
2,651 (46.8%) | 11 (20.8%) | 646 (52.1%) | 3,308 (47.5%) |
| Total |
5,665 | 53 | 1,241 | 6,959 |
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