Oh My Girl appeared on MBC Everyone's 'Weekly Idol' on November 4 and proved that they might appear all cheery at times, but they undergo their own hardships.

On this day, they passionately sang the cheer song "Be Strong, Dad," during which they all became quite emotional.  Binnie did aegyo for the camera, but started crying while singing the song.  However, the MCs could then not help but guffaw when they found out that she had been with her father during the Chuseok holiday not too long ago.

SEE ALSO: Wave of flight cancellations hits Korea as citizens grapple with trauma from plane crash

It was YooA's turn next to sing, but her eyes were already shimmering with tears.  As they fell down her face, she was unable to finish.  She was asked, "Where do your parents live?" and she replied, "Seoul," making the MCs comically rage out of incomprehension for why the girls were getting so emotional.

Surely they have their reasons!  It's hard being so far from your parents at such young an age!