Shin Sol-i isn't shy about her unrequited crush on Cha Heon, her next-door neighbour, so one day she decides to write him the perfect love letter.

Woo Dae-sung ditches swim practise before a competition for a fun night out at karaoke; when Heon is down, Sol-i wants to be by his side.

Sol-i surprises her friends by declaring that she's running for class representative; while Dae-sung shows his support, Heon disappoints her.