Seo-Ri was burned out! After finally ditching her demanding, high-pressure job, she moves back home. Her well-meaning brother insists she needs to relax and urges her to join swimming lessons. Reluctantly, she agrees, not knowing this decision would completely change her summer.

At the pool, she meets the handsome instructor, Yu-Jeong. Turns out, he's not just some random acquaintance; he's her brother's friend who instantly recognizes Seo-Ri as his unforgettable first love from years ago! Talk about a splash of destiny!

As the temperatures rise and the summer storms pass, the undeniable chemistry between Seo-Ri and Yu-Jeong ignites. Can a second chance at first love blossom under the sizzling summer sun, or will their past and new pressures keep them apart? Dive into this steamy and emotional reunion romance!