Kai-En is a popular internet singer. He becomes famous with a song about his first love. Cora, the manager of the famous dessert store "K.," wants him and the store owner Yi-Fan to work together. After Kai-En finally says yes, they meet up in a concert and are unexpectedly attracted to each other. However, Kai-En reveals that he doesn't like desserts.

Yi-Fan makes a bet that Kai-En will fall for his dessert. If he loses, he will do anything Kai-En wishes. When Kai-En sees the cake, he resents it as always. But after he tastes it, he actually falls for it! As their collaboration begins, Kai-En starts to make desserts with Yi-fan.

The electricity suddenly goes out in K. Yi Fan is panicking because of the darkness. Kai-En goes to calm him down. It brings them closer. Cora suggests to promote a gay marriage. It turns out that one of the grooms Su Da is Kai-En's first love in high school.