Seongnam FC U18: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2022-02-07 | Ji-soo Kim | Seongnam FC U18 | Seongnam FC | — |
| 2020-01-01 | Ji-soo Kim | Seongnam FC U15 | Seongnam FC U18 | — |
| 2018-01-01 | Tae-joon Park | Seongnam FC U18 | Seongnam FC | — |
| 2017-01-01 | Min-kyu Kim | Seongnam FC U18 | Seongnam FC | — |
| 2015-01-01 | Tae-joon Park | Seongnam FC U15 | Seongnam FC U18 | — |
| 2014-01-01 | Min-kyu Kim | Seongnam FC U15 | Seongnam FC U18 | — |
| 2013-03-01 | Kyoung-rok Choi | Seongnam FC U18 | Ajou University | — |
| 2013-01-01 | Kyoung-rok Choi | Yeouido HS | Seongnam FC U18 | — |
| 2013-01-01 | Je-woon Yeon | Seongnam FC U18 | Sun Moon Uni. | — |
| 2013-01-01 | Dong-jun Kim | Seongnam FC U18 | Yonsei Univ. | Free |
| 2011-01-01 | Ui-jo Hwang | Seongnam FC U18 | Yonsei Univ. | — |