Cinematography
Composer
Editor
Original Creator
Screenwriter
Screenwriter & Director
Visual Effects
Main Role
- So Ji Sub Main Role
- Son Ye Jin Main Role
- Kim Ji HwanJi HoMain Role
Support Role
- Ko Chang SeokHong GooSupport Role
- Lee Yoo JinJung Woo Jin [High school age]Support Role
- Kim Hyun SooIm Soo Ah [High school age]Support Role
- Bae Yoo RamHong Goo [Teen]Support Role
- Seo Jung Yeon[Seo Bin's mom]Support Role
- Lee Joon HyukSwimming instructor ChoiSupport Role
- An Seong Won[Ji Ho's classmate]Support Role
- Jung Soo BinSo JeongSupport Role
Guest Role
- Park Seo JoonJung Ji Ho [College student age]Guest Role
Bit part
- Jo Ha Seok[Relative]Bit part
- Shin Woo Hee[Ji Ho's homeroom teacher]Bit part
- Eom Seo HyunNa EunBit part
- Jung Seo In[Female relative]Bit part
- Son Yeo EunHyun JungBit part
- Gong Hyo Jin[Hanbok woman]Bit part
- Choi Eun Hoo[Ji Ho's class friend]Bit part
- Park Yoon Young[School arts festival MC]Bit part
- Baek Hyun Woo[Maths teacher]Bit part
- Gam So Hyun[Ji Ho's class friend]Bit part
- Lee Seung Joon[Past physical education teacher]Bit part
- Choi Dong Hwa Bit part
- Seo Young Sam[Bus driver]Bit part
- Jung Hyun Woo[Waiter]Bit part
- Cha Bong Joo[Theater toe sock man]Bit part
- Shin Woo Hee[Ji-ho's homeroom teacher]Bit part
- Kim Ha Neul Bit part
- Kang Tae Ung[Ji-Ho's classmate]Bit part
- Jang Woo YeonEnglish Teacher (Past)Bit part
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