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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.

What does the LE SSERAFIM members do on their day offs after their promotions end? Watch to find out!

With an entirely new set of actors, this movie continues the story from Swordsman (1990). Blademaster and his martial arts school decide to retire to a distant mountain. Before leaving, he visits his friends, a tribe of snake-wielding women warriors. He finds that they have been attacked, and their leader, Princess Yin-Yin, toward whom he has some romantic feelings, has been abducted. The attacker is her evil uncle Fong, who years before overthrew Yin-Yin's father and took over their sect. Fong also has possession of a sacred scroll which tells how to achieve ultimate martial arts power. Blademaster decides to help Yin-Yin and her imprisoned father, and his romantic complications deepen when his childhood chum and Yin-Yin are joined by a new rival. Blademaster thinks she is an innocent village girl he has saved, but in fact she is Fong! The process of gaining ultimate martial arts power requires self- castration and transmogrification into female form.