The story takes place in Haeundae, Busan, South Korea. During the 2004 Indonesian tsunami, due to the mistake of captain Wanshik (played by Seol Kyung-gu), Yeon-hee (Ha Ji-won) was killed He felt deep self-blame in his heart for the death of his father, and took care of his neighbor sister meticulously. Gradually, the two developed a secret love. However, Wan Zhi's middle school classmate Wu Dongchun (played by Jin Inquan) is not optimistic about this pair of fateful mandarin ducks. Man-sik's younger brother Hyung-sik (played by Lee Min-ki) is a lifeguard at sea. During an operation, he met a wealthy lady Kim Hee-mi (played by Kang Ye-won). The two had many misunderstandings during their interactions. Virgin (played by Uhm Jung-hwa) promotes Haeundae to become an ambassador for the World Expo tourist attraction. She has a daughter with her ex-husband, geologist Jin Hui (played by Park Joong-hoon) of the International Ocean Institute, but she has found another lover. Dr. Kim was very depressed about this. At the same time, he found during his observation that the geological conditions of the East China Sea in Malaysia and Haeundae were exactly the same as the 2004 Indonesian tsunami. A rare and huge tsunami was approaching Haeundae, but the Disaster Prevention Agency did not take it seriously...
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