"Yeong-gu, are you going to study abroad? ㅜㅜ"
"Why are you being so annoying? I told you I'd be back in three years."
"Mr. Woo, if you don't come, I'll kill you. Come when you're 18. Contact me at least once every two weeks."
"Saying such harsh things..!"
"So, keep in touch and live."
"Hey, see you in three years."
At this time, the female protagonist was 15 years old, and it was probably February, as she remembers.
Joo-young smiled at Yeo-ju and said they'd meet in the second year of high school. He took a letter out of his pocket and gave it to her before leaving the cafe. Yeo-ju blankly wondered if that kid had really left, then stuffed the letter carelessly into her bag and ran home to read it in peace.
to. Lee Yeo-ju
Our Malrangkongjjak-i Yeoju, you have to do well without this older sister and live smiling while playing tiki-taka with Bunny and Tteolang. I cried as soon as I opened this letter... Ugh, I'm writing this with my eyes and chestnuts on. Are you crying too..? I'm writing this letter only to you, but I hope my feelings are conveyed properly. Let's meet in the second year of high school classroom in 3 years.
"... Ugh, uh..."
The letter paper was soaked with the heroine's tears, and today was a night with an unusually sad moonlight and an unusually bright starlight.
***
And the next day, the three of them wait for Jooyoung at the airport.
"Oh, it's hot"
"My legs hurt..."
"So, Kim Taek"
"grave"
"When are you going to pay me back 3,000 won?"
Phew,
"3,000 won for the first time?"
"I'll give it to you within 3 months, but it's been over 2 years."
"ㅋㅋㅋㄹㄹㅋㅅㅋㄹㅋㅅㅋ (snickers)"
While Yeo-ju is receiving 3,000 won through threats(?), Jung-kook is lying on the airport floor. Tae-hyung glares at Yeo-ju, saying that 3,000 won is the price of tteokbokki and sundae at the snack bar in front of the school.
"Huh... Are you guys really like that?"

Yes, Kang Joo-young has returned before our eyes after three years.
