In the kingdom of Boka Boka, lives Princess Camellia, who can speak to magical creatures. One day, she loses control of three such creatures, causing them to flee. She sets on a quest to find them and lands on Earth. Meanwhile, human sisters Maggie and Michelle are eager to see SNH48 live, but their fairy caretaker Shirley doesn't agree. They find Camellia, and together with her and fellow Princess Emma of Gemini, they set off to the magical creatures.

A playboy business tycoon, Liu Xuan, purchases the Green Gulf, a wildlife reserve, for a sea reclamation project, and uses sonar technology to get rid of the sea life in the area. Unknown to him, the Green Gulf is the home of merpeople, and the sonar has caused many of them to succumb to illness or die. Xuan's business ventures in the area are threatened when he crosses paths with the mermaid, Shan, who is sent to avenge her people.

Having died unexpectedly, firefighter Ja-hong is taken to the afterlife by 3 afterlife guardians. Only when he passes 7 trials over 49 days and proves he was innocent in human life, he’s able to reincarnate, and his 3 afterlife guardians are by his side to defend him in trial.

As the deceased soul Ja-hong and his three afterlife guardians prepare for their remaining trials for reincarnation, the guardians soon come face to face with the truth of their tragic time on Earth 1,000 years earlier.