They remind me of an immature couple. They haven't explicitly said they were together abd kind of got together through circumstance during high school. Their bickering is childish and silly, they act boyish which is why I said they were immature in the beginning. And I meant that as neither a positive or a negative, but their dynamic is entertaining.
I can tell this is a novel adaptation. Also, AAGGHHHH I LOVE JIGU SO MUCH HE'S SO RELATABLE. Well not every part of him, mostly his awkward and cringe comments and behaviors. Relative to the overall story, the burn is SO SLOW (this is not a complaint). It's kind of refreshing. Finally, their characters are so enjoyable to witness, their quirks make them even more endearing (don't if that's that right word). Like Jigu's excessive swearing and chronically online speech or Yeo-woon's mumbling
A First of Summers