26-year-old Yong-jun hasn't quite figured things out yet – but when he reluctantly agrees to start working part-time for his parents' lunchbox shop, a chance encounter suddenly breathes new life and possibility into his summer. Making a delivery to a swimming pool, he meets and immediately falls for Yeo-reum: the sunny and devoted sister to Ga-eul, a gifted swimmer who is deaf and training to qualify for the Olympics. The two sisters communicate in Korean Sign Language, which Yong-jun is fluent in too. Chasing his heart, Yong-jun sparks a journey of discovery in all three of their lives.
Hong Kyung
Roh Yoon-seo
Kim Min-ju
Jung Yong-ju
Jeong Hye-young
Hyun Bong-sik
An Min-young
Go Gyeong-man
Jang In-ho
Ha Seung-youn
Kim Ga-eun
Jo Ha-neul
Shin Hye-ri
Oh Hyeon-jin
Yoo Ga-eun
Kim Ji-in
Kim Si-chan
Oh Ji-young
Lee Hwan-beom
Han Jae-ah
Choo Han-sol
Kim So-hee
Park So-jung
Kim Hyeon-ji
Jo Deok-hyeon
Lee Seo-jin
Go Jae-kyeong
Ha Si-an
Lee Woo-joo
Choi Do-yoon
Cho Kyung-jae
Im Hyeong-seok
Ko Ye-lin
Ha Young-jin
Park Ye-ni