Responses
it's right here https://www.mangago.me/read-manga/happy_together_paradise_scans/
to answer the first part of your question: if the title has been changed sometimes it can seem like a story is gone when it's actually not, it's just been renamed and sometimes the site wont register when you search with an ALT name
What is the reason some manga/manhua/manhwa are missing in this site? I just notice Happy Twogether is not here anymore.