주객전도가 · 주객전도를
role reversal; the side issue overshadowing the main thing
Example
선물보다 포장이 더 비싸면 주객전도예요.
If the wrapping costs more than the gift, you've got it backward.
Word parts
주 host+객 guest+전 topple+도 fall
Literally 'host and guest turned upside down.'