The ups and downs of school, family and growing up test the affection between a budding artist and her handsome but indifferent classmate and neighbor.
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.
Desperate for prize money so she can buy Heon a birthday present, Sol-i pours all her energy into winning at the school's sports competition.
Jiang Chen refuses to participate in Xiaoxi's production of My Fair Princess for the school contest; Wu Bosong grows closer to XIaoxi while practising lines.
Reeling from the embarrassing mix-up in the play, Xiaoxi struggles to prepare for her final exams; Xiaoxi's parents debate about whether to transfer her to a different school.
Excited to try out for a TV singing competition, Jeong Jin-hwan asks friends to come and support him. Sol-i worries when her parents fight.
Heon agrees to spend a Saturday with Sol-i, who wants to take him to see his favourite soccer team, but his mood soon sours.
When a confession note makes Sol-i awkward around him, Dae-sung assures her it was a joke. Jin-hwan gets help facing his bullies.
Wu Bosong discovers a way to spend time with Xiaoxi when she is quarantined for avian flu, putting himself in the line of fire.
As Christmas grows nearer, Xiaoxi decides to take up knitting; while delivering Mr Li a scarf, Lin Jingxiao notices another gift on his desk.
Wu Bosong encounters the national team coach; Xiaoxi is hoping for a romantic evening with Jiang Chen under the fireworks until she spots him with Li Wei.
A devastated Xiaoxi refuses to talk with Jiang Chen, despite his attempts to fix their relationship; Li Wei is caught cheating on a test.
Hui-ji steals from the school nurse's office; Jin-hwan stops coming to school when he finds out about Ha-young's crush on someone else.
An injured Wu Bosong is forced to forfeit the swimming competition; Xiaoxi sets her focus towards study so she can join Jiang Chen in Beijing.
Jingxiao stops by the hospital to help Lu Yang with his school work; Jiang Chen's mother refuses to accept his decision to drop out on Tsinghua University.
As all her friends get accepted into college, Sol-i feels down about herself, Heon encourages her to keep trying, and promises he'll help.
Xiaoxi and Jiang Chen are entered into a best couple contest at university; Jiang Chen asks his mentor to assist with Lu Yang's surgery.
Sol-i stuggles while looking for a job and putting up with Heon's work schedule, then she snaps when she finds out he may be leaving for America.
After a chance meeting with Xiaoxi three years later, Jiang Chen helps organise her dad's surgery and prepares to win her heart.
As Jiang Chen and Xiaoxi discuss the issues of their past break-up, Xiaoxi is shocked when Jiang Chen asks her for another chance.
Heon shows up to a gathering in his old school uniform and gets honest about his feelings; Dae-sung decides it's time to bare his heart to Sol-i.
Xiaoxi's parents make an unexpected visit while Jiang Chen is staying the night; Xiaoxi's friends organise a surprise showing at her book signing.
