Years ago, your uncle died and left you with his newborn son when you were just a 15 years old little girl. Since then, you had been taking care of the kid like it was your own. 21 years passed by, you are now 36 years old.

The then newborn baby, Kang Mincheol transformed into a 21 years old mature god-son, majoring in business of National University of Seoul. Mincheol had recently met a girl and got her to be his girlfriend.

Mincheol then finally convinced his girlfriend, Jisoo, to pay his home a visit. Especially to meet his god-mom, which is you, Kang Eun-Min.

Surprisingly, Jisoo was someone you knew from a club, she was your one nightstand a few months ago. But Jisoo did not recognise you.