| Season | Age | Team | G | GS | IP | K/9 | BB/9 | HR/9 | BABIP | ERA | FIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020 | 33 | LG Twins | 13 | 13 | 64 | 7.2 | 3.9 | 1.1 | 0.320 | 5.34 | 5.00 | 0.49 |
| 2019 | 32 | LG Twins | 29 | 28 | 168.1 | 6.6 | 3.2 | 0.9 | 0.314 | 4.12 | 4.26 | 1.43 |
| 2018 | 31 | LG Twins | 29 | 29 | 170.0 | 7.2 | 4.2 | 1.4 | 0.295 | 6.09 | 5.81 | 0.60 |
| 2017 | 30 | LG Twins | 28 | 28 | 175.2 | 8.0 | 1.9 | 1.0 | 0.296 | 3.43 | 4.14 | 3.28 |
| 2016 | 29 | Samsung Lions | 24 | 24 | 152.1 | 7.1 | 3.8 | 0.9 | 0.329 | 4.73 | 4.97 | 2.92 |
| 2015 | 28 | Samsung Lions | 31 | 29 | 173.0 | 10.1 | 3.8 | 1.5 | 0.299 | 4.79 | 4.78 | 3.01 |
| 2014 | 27 | Samsung Lions | 69 | 0 | 82.0 | 8.7 | 4.6 | 1.0 | 0.320 | 5.60 | 4.88 | 0.84 |
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