Doomsday Drift: The Last Ark

A tsunami apocalypse hits the world without warning, and overnight all the land is submerged. In his past life, security guard Zhao Chuan worked himself to the bone to protect the residents of his building and even built a wooden raft with his own hands to save people, only to be heartlessly pushed into the water and drowned because the raft was overloaded. After his rebirth, Zhao Chuan unlocks a Savior System: save people, and his vessel levels up. This time he makes every preparation in advance, repaying kindness and avenging every wrong.