Suh-hee is left by her mother at an orphanage as a small child. She grows up at the orphanage and becomes close to Sae-joon, the son of the orphanage's director. The Director objects to her son dating Suh-hee and kicks Suh-hee out of the orphanage shortly before she graduates from high school. Suh-hee must survive on her own in the outside world. Sae-joon continues to love Suh-hee despite his mother's objections.

More than 900 years ago, the mermaid princess Ao Fan Fan was rescued by the scholar Huo Yun Shen, and so she was determined to commit herself to him when he reaches 25 years old. The strange thing is that Huo Yun Shen has lived in every life and died mysteriously before the age of 25 every time. In this life, Ao Fan Fan went ashore earlier to find Huo Yun Shen.

During the Ming Dynasty, executioner To Sei Hoi and his god-brother, Shui Yu Chan, a doctor, accidentally enter the town of Cheung Lung. Cheung Lung appears to be a happy and peaceful place. However, underneath the facade, it's hiding a very big secret. The brothers meet the town's wealthiest man Fok Tin Ming, as well as his stubborn and unreasonable daughter, Fok Sin Yiu. By mistake, Hoi and Yiu get married and become husband and wife. Suddenly, a number of murders happen in the town. While investigating, Hoi discovers that he and Chan are being caught in a trap. It turns out that there's someone behind the scenes pulling the strings. But, who is it? Is it a god? A person? The unknown causes immense fear in people...

Commander Sugata is a scientist and sage who excels in mental reinforcements and is a master of every martial art. He discovered the existence of the Underground Empire Tube, a once peaceful kingdom that has turned into a malignant force under the mysterious Zeba, who desires to conquer the surface. In order to stand against them and thwart their plans, Sugata recruits five young people to become the Maskmen. Each becomes specialized in a style of martial arts, and Sugata teaches them the ways of the mystical "Aura Power" energy. A year after Sugata recruits and trains the Maskmen, the Underground Empire Tube is ready to strike. Princess Ial of the deposed Igam Royal Family, sent to spy above ground as Mio, falls in love with Takeru, and wishes for those underground and above ground to coexist. She is kidnapped and imprisoned in ice for her betrayal. As Takeru and the Maskmen battle Tube, they learn about Ial and Igam's relationship, and a terrible dark secret about Zeba, the Tube leader.

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