The man's name is 'Woo-jae'.
His wife is a famous drama writer, but he is an unknown movie screenwriter.

For the stability of his family, the man promises to support his wife, Seo-jin with child-care until his daughter turns 8.

However, as his daughter grows older and his wife keeps getting famous, the man's heart grows empty.

One day, an unknown woman approaches the man saying his wife, Seo-jin, is doing dirty things. She also says that she will teach him the way to kill.