Jooyi was never the outgoing kind of girl. One day, her friend begged her to see a concert by a boy band she hardly knew, but because they were free tickets, Jooyi decided she shouldn't waste them and went along. The boy band were singing songs she never really heard before. But somehow she liked most of them. All of a sudden, the group stopped and said they were going to pick a fan to sing a duet with one of the lead singers. Coincidentally, her seat number was called out.

Paralyzed with fear, she refused to go up, but the singer himself went down to invite her. Nervously, she asked if she could sing something else since there wasn't any song suitable for a duet. So the lead singer went along. It was the moment of truth, and Jooyi, though afraid, looked into the lead singer's eyes and belted out her song. The crowd cheered and even the lead singer himself was surprised.

The song ended, Jooyi and her friend were leaving when the manager rushed to find her, asking if she would like to be part of an experimental project. Thus began a new adventure for Jooyi, with the lead singer and their serenade.

A song that started it all.