Ocean pollution causes tsunamis and coastal cities become no-go areas.
Employee Yu Junhui risked his life to deliver documents to the female boss Song Yinyin, but found that she had been eroded by polluted seawater, and her legs had turned into fish tails, turning into a "mermaid" that was half human and half fish. He was trapped in a sealed apartment, sharing a room with this mutant who could lose control at any time.
At first, he was fearful and defensive, but in the life and death situations, he no longer saw a "monster", but a soul that tenaciously survived in desperate situations. When black market traffickers disguised as medical staff forcibly abducted Song Yinyin and sent her to an underground auction house, Yu Junhui resolutely stepped into the dragon's den. He endured humiliation, dealt skillfully, and left a distress signal in a desperate situation. In the end, he cooperated with the police to destroy the criminal den in one fell swoop and rescued hundreds of imprisoned mutants.
A year later, a medical breakthrough gave the two men a new lease of life. From being forced to live together to sharing life and death, from fear to protection, they used courage and kindness to compose a love song about hope and redemption in the ruins of the apocalypse.
