Hi. Both HackerSpaceSeoul and HackerspaceSeoul lack the named flag, which likely is why tor isn't allowing you to refer to it by the nickname. Have you tried referring to it by the fingerprint instead?
Speaking of which, TorCtl is being deprecated in favor of a couple newer controller libraries...
https://stem.readthedocs.org/en/latest/ - replacement with a similar design to TorCtl, see the tutorial for usage https://txtorcon.readthedocs.org/en/latest/ - twisted controller library
If you try using stem then let me know if run into any issues or have questions! -Damian