Located on the southeastern tip of the Korean Peninsula, the Haeundae district of Busan draws one million visitors to its beaches every year. Five years ago, Man-Sik, a Haeundae local, lost Yeon-hee's father due to his mistake in the 2004 Indian Ocean earthquake while deep-sea fishing together at the Indian Ocean. Because of this, Man-sink wasn't able to become involved with Yeon-hee, who runs an unlicensed seafood restaurant, despite her attempts to start a relationship (Yeon-hee does not know that her father was killed due to Man-sink's mistake).
Dong-Choon and Seung-Hyun's Grandma team up with Seung-hyun and gets involved with some 'illegal' activity to earn money, but the two end up getting caught by the police. After wards, Dong-choon's mother finds out that Man-sik's uncle (Eok-jo) was with her when the tsunami hit. She was worried about Dong-choon while Eok-jo was worried about Man-sik. Seung-hyun meets Ji-min and decides to prepare him for a job interview, but Dong-choon refuses. As time passes, Man-sik finally plans to propose to Yeon-hee on a night with fireworks.