Eun-jin Pang	...	(Director)
Keigo Higashino	...	(Writer)
Seung-beom Ryu	...	Suk-Go
Yo-won Lee	...	Hwa-Sun
Jin-woong Jo	...	Detective Min-Bum
Yoon-Seong Kim	...	Sang-joon
Min-ho Kwak	...	Cheol-min
Jung-pyo Park	...	Doctor
Ikyoung Shin	...	Composer
Chan-min Choi	...	Cinematographer
Eun-ja Baek	...	Editor
Sung-Yup Yoo	...	Editor
Yu-won Lee	...	Hwa-Sun

Summary: Seemingly an ordinary math teacher in high school, Suk-go is indeed a brilliant mathematician. Hwa-sun is his neighbor. They become inseparable when Suk-go decides to cover up Hwa-sun's accidental murder while she was mercilessly beaten by her ex-husband.