Two scientists are trying to find any evidence to prove that merpeople are real. The three male leads, who are all mermen, are trying to figure out whom the two scientists are and why they want to prove that merpeople are real, so they investigate quietly in an aquarium. The longer they stay, the further they get involved with humans, especially beautiful young girls. One day Fahfon went for a party on a yacht and fell into the sea, she was saved by Talay, one of the mermen, who tried to breathe air into her mouth under the water. But when a merman kisses someone on the lips, that person they kiss will turn into a mermaid. So Fahfon turns into a mermaid and Talay is helping her to understand more about merpeople and making sure she does not expose their secret. Things are getting more confusing for them to keep their secret and get away from people who are after them.