The male lead's childhood friend (and female lead) is often mistaken for a girl.
One day, this childhood friend found a magic lamp and made three wishes to the genie: to become super rich, to turn the male lead into a girl so she could tease him, and to stay together with him forever.
But the fake genie messed everything up! She got only a tiny bit of money, the person who turned into a girl was herself, and in the end, the two of them would die if they got more than ten meters apart!
So now the two of them will be together forever~