What do you mean, both mother and fetus are single?

Refers to people who have been single since birth and have never been in love.

The word "single mother and fetus" comes from Korean. The word "single mother and fetus" first appeared on a variety show in South Korea. The host said: "That man is ugly, so he was destined to be single all his life when he was born." Later, this sentence spread through various social platforms and was redefined, which became a short but incisive "mother-child list".