Busan only had a 2-yr contract, and they are not renewing, so I guess LPGA is looking for a new venue. Not sure how long the contract with BMW is - maybe that was also just 2 years. And the club even changed their name back to Asiad CC.
Hmm, just found another article from 2018 when the deal was announced:
SEOUL, May 24 (Yonhap) -- German automaker BMW will sponsor a new LPGA Tour event to be held in the southeastern port city of Busan, officials said Thursday. BMW agreed to serve as the main sponsor for the US$2 million tournament, which will be held at the Asiad Country Club in Busan, 450 kilometers southeast of Seoul, for three years starting in 2019. The exact name of the tournament will be determined later.
Not sure if that means BMW is done, or they will still sponsor a tournament this year, since the 2020 one was cancelled....