| Artist name | Roles | Recordings |
|---|---|---|
| Eluphant | recording | Ophilia, Please Show Me Your Smile |
| The Quiett | mix, producer | Ophilia, Please Show Me Your Smile |
| 샛별 | vocal | Ophilia, Please Show Me Your Smile |
| Artist name | Roles | Recordings |
|---|---|---|
| Bullfrog Blues Machine | tenor saxophone | Simple Life, To Tame a Wild Horse |