BUR #19463 has been approved by @evazion.
create alias yi-sang_(limbus_company) -> yi_sang_(limbus_company)
His official artwork (post #5026033) uses Yi Sang, and his inspiration's name is also written as Yi Sang.
The only instance in which it was written as Yi-Sang seems to be this tweet which announced his character design way before Limbus' release.
An example of it being spelled Yi Sang in both official announcements and ingame text