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Checkpoint
✓ The female protagonist has some feelings for him, but he doesn't accept it yet.
✓ Jeonghan gets excited about everything the female lead does, but he gets especially excited when she uses formal language.
✓ Yeoju is actually a liberal arts major.
✓ The female protagonist quite likes to play pranks on Jeonghan.
✓ The female protagonist was a little excited about Jeonghan.
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The plot twist
...I'm just a little excited
I got that person's vibe from that kid.
I really hate that person. I resent him so much.
I feel so stupid for still thinking about that person.