The MV/title track usually comes out about a month early, but the actual album with the full track list does not come out until the date listed.
The song and the MV usually serve as the promotion/marketing to buy the album. Similar to how Western celebrities release 1 or 2 singles leading up to the actual release of an album.
I actually think KPOP is more of an outlier in regards to releasing the album and title track all on the same day.
ohh thanks yeah i always wondered about that cause they don't ever write the actual date the mv comes out
yeah i guess i wouldn't know about that i mostly only listen to kpop loel but it's a good idea