Tidal Wave is a South Korean disaster film set in the popular coastal city of Busan. The story follows several characters living in the Haeundae district, including Man-sik, a humble seafood worker, and his love interest, Yeon-hee, who runs a local restaurant. Their quiet lives are disrupted when unusual ocean activity is detected by scientists.
A marine geologist named Kim Hwi notices signs of a massive tsunami forming in the Sea of Japan. Despite his warnings, local officials are hesitant to act, fearing panic and economic loss. Meanwhile, the beach town is busy preparing for a summer festival, with thousands of tourists unaware of the looming danger.
As tensions rise, the relationships between the characters deepen. Man-sik struggles to confess his love to Yeon-hee, and Hwi tries to reconnect with his ex-wife and daughter. These personal stories unfold against the backdrop of growing signs that disaster is near.
Suddenly, the tsunami strikes with terrifying force. The massive tidal wave crashes into Haeundae, destroying buildings, flooding streets, and causing widespread panic. Many characters fight to survive, and several sacrifices are made in the process to save others.
In the aftermath, the survivors mourn the loss of loved ones and their shattered hometown. Tidal Wave ends on a bittersweet note, showing both the resilience of the human spirit and the devastating power of nature.