A mild-mannered stamp maker searches for the man who slept with his wife. Disguised as a customer, he approaches the man.

In 2028, cartoonist Han Cho becomes obsessed with his neighbor, an assassin named Nana. He professes his love for her but she remains indifferent. By accident Han Cho finds an amnesia-inducing drug which he uses to spike Nana’s drink. With her memory blanked out, Nana is told that she is Han Cho’s girlfriend.