By chance, Gu Siyu rescued Luo Yun
Many years later, they returned to Fuze Middle School as teachers
They came to the rooftop and chatted about the past...
Gu: "Actually, I saw you downstairs that year. I was worried about you so I followed you."
Luo: "Didn't you see it before?"
Gu: "Well, what happened later was..."
Luo: "Just what?"
Gu: "I don't know... Maybe it was love at first sight. Anyway, I really like you, but I don't know why."
Luo: "Oh, I don't really believe in love at first sight. I don't think it lasts long."
Gu: "I don't know about others, but I will always like you."
Idea: a sudden thought