Also known as: マミジロキビタキ, Korean_flycatcher, tricolor_flycatcher
Latin: Ficedula zanthopygia
JP: マミジロキビタキ mamijirokibitaki
Almost identical to the Narcissus Flycatcher, with a black mantle split by a pale eyebrow & white wing bar with an orange-to-cream underside, the yellow-rumped flycatcher has a white eyebrow and (per the name) a bright yellow rump.