Hong Tae-yi had a big fight with Shin Yi-ru, a team member of the same group project, who did not get along with her at all. Then, she finds a strange application on her phone and meets Shin Yi-ru again at a drinking party. But what is that number floating on his head? Hong Tae-yi creates an event without even realizing it.

"I don't know yet... Can you tell a little more? Tae-i noona?"