Are Yeoju and Jisung childhood friends?

Class 1, Grade 3

Heroine: Hello, Ji-seong?

Ji-seong: Um... Are you here?

Heroine: What are you thinking?

Jisung: Yes, I think so~^^

Heroine: What???????

I just like you♥ Can't you go out with me???

Heroine: Ji... Ji-seong, hello?

Shinbi: What is he doing? Is he rapping?

Sowon: I see...

Jisung: Oh...okay, hello, good morning hahaha

Shinbi, Sowon: What? Did you two not eat well last night?

Sowon: I'm asking because I thought you guys might be wondering, but did you guys decide to date???

Ji-seong, Yeo-ju: Ugh......

Sowon, Shinbi: What????!!!!!!!! Congratulations!!!!! You look great together!!!!