The mc loves money very much. He gets fired from the company he used to work and is brought into a game like scenario where he must survive and complete an encyclopedia book(collect info). The first scenario is about a town related to mermaids where ML is a bug(not literally) and appeared as Mermaid king. The second one is about a train I think. I was waiting for more chapters to binge read it but forgot the title. Now I can't find it! Please tell me the name if know it.