In the Summer

In the Summer follows Jun-hee, who harbors a secret crush on her classmate Dong-kyun. The story unfolds when a chance encounter leads to a kiss while Dong-kyun is asleep. Soon-young, who witnesses the moment, becomes entangled in their lives as she promises to keep Jun-hee's secret but uses it to manipulate her.

As the summer break progresses, Jun-hee and Soon-young's friendship deepens while they navigate their feelings for Dong-kyun. Soon-young's curiosity about Dong-kyun grows, leading to tension between the three characters. On Dong-kyun's birthday, the dynamics shift when Soon-young discovers Jun-hee and Dong-kyun spending time together, highlighting the complexities of loyalty and desire during adolescence.