the.com/flipside

means The other side of a situation — the drawback, cost, or consequence that balances out the appealing part.

from Straight out of record culture: a vinyl single had an A-side (the hit) and a B-side on the flip — literally the 'flip side.' By the mid-1900s, 'flipside' had slid into everyday speech to mean the reverse or less-obvious half of anything, the part you don't hear on the radio.