Diane and Paul, both psychologists who study primate behavior, live next to each other and share the same hobbies, but they never seem to have a connection or date. Paul went to the psychic because he couldn't get a girlfriend. She gave him a dose of Love 9's magic water and told him about the wonderful use of the water. After watching the magic effects of cats and orangutans, Paul and Diane agreed to use themselves as the subjects of the experiment. Sure enough, under the effect of Love 9, Diane and Paul finally felt the taste of being a "heartthrob", and even they themselves could not escape the charm of each other and fell in love. But somehow, Diane went back to her ex-boyfriend, and Paul couldn't get her heart back, so he turned to the psychic for help again.