Are they consider as debuts or there has to be something by the label or artist confirming the actual debut?
Like for example Baekhyun released OST before his debut but his actual solo debut was in 2019 with City Lights, Chen is another example from the same group.
The rap line of BTS (RM, SUGA, J-hope) has released mixtapes but the label nor the members have ever say anything about that being solo debuts. Seventeen’s Hoshi and recently Woozi released their mixtapes as well. Are those type projects considered as solo debuts or no?