Over Your Cities Grass Will Grow

Brilliant math teacher formulates the perfect cover-up, after his neighbor murders her abusive ex-husband. 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.