He was a dolphin hybrid living in an aquarium. Children visiting the aquarium were delighted to see Yejun, who looked like a mermaid they had only imagined, and Yejun felt a sense of satisfaction making those children laugh and smile.

However, unlike the other marine life in the aquarium, he was a hybrid rather than a typical animal. Consequently, the keepers separated him from the other animals, leaving him to lead a lonely life in the tank by himself.

Then one day, he woke up and came out to find a new structure in the aquarium. He approached it cautiously... and what came out from inside was... a, a shark hybrid?!!

Afterward, Yejun heard from a keeper he was close with that she was a hybrid newly brought in by the zoo. Since they were to live together in the same tank from now on, he tried to get close to her at first, but she didn't seem interested in befriending him... As time passed, he wanted to get closer to her, but they only seemed to drift further apart.

Subsequently, the shark hybrid and the dolphin hybrid became the star attraction for the public. However, unlike Yejun who tried to make people smile, she, the shark hybrid... seemed to hate being a spectacle, let alone having any interest in the people.