Raft Survival: I Have a Floating Building

Tsunami, flood! Sharks and monsters under the sea. Yang Yisu traveled to a world three or four times the size of Blue Star, with 99% of it being ocean. While others only had a small raft floating for survival, Yang Yisu was basking in the sun and drinking a drink. What, why can a building float on the sea? Spongebob is already capturing humans while riding Patrick, and you actually care about this!