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"The blue sea" is an action drama that tells the story of a mysterious young man who lost his memory. Jo Eun Hee is a female soldier in the navy who works with Sung Ki Soo to carry out special missions under UDU (Underwater Demolitions Unit) Sung Ki Soo is a navy lieutenant who is also a professor at the non-commissioned officer department who is the first to see through the identity of the young man who lost is memory.

Kaoru Fukazawa is a manga artist. His manga series was published for eight years, but has now finished. He doesn't have any ideas for his next work. His situation seems bleak, with his editor seeming to not care about him anymore and his relationship with his wife Nozomi Machida being troubled. He spends his days in despair and darkness. Kaoru visits a business that provides sexual services and meets a prostitute named Chifuyu, who attracts him. They decide to head to Chifuyu's hometown together.

Itt was raped by Day because Itt was the mastermind behind the plan that hurt Day’s younger brother Night. This plan was to trick Night into falling in love with Itt’sfriend, Gear who then raped him. Day discovered the plan after it happened and took his revenge by raping Itt and videotaping the rape as blackmail material. Whenever Itt said something that Day didn’t like, he would verbally and physically beat and abuse him. Day used this videotape to blackmail Itt, and forced him to come and live with him. They started to grow feelings for each other despite the extreme situation. Especially Itt who wanted Day to make his feelings clear. So he ran away with the help of Night. After this Day went crazy when he found out and realized how much he really liked Itt despite what he did to him.