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During her freshman year in high school, Mika Tahara (Yui Aragaki) loses her cellular phone, but later finds it in the school library with the help of an unknown caller. Throughout the summer, Mika and the mysterious caller continue to...

Oh Ha-Na (Ha Ji-Won) and Choi Won (Lee Jin-Wook) are both 34-years-old. They have been friends for 17 years. Oh Ha-Na is currently a career woman with an honest and confident personality. Choi Won works as an assistant purser for an airline. He has always helped Oh Ha-Na whenever she got into trouble. Cha Seo-Hoo (Yoon Gyun-Sang) is a pianist with a free spirit and Lee So-Eun (Choo Soo-Hyun) is a cabin attendant for an airline. Will Oh Ha-Na and Choi Won find love?