Fl and ml lives in different places but their homes are connected magically .Ml cant see fl and he thinks she is a ghost.Fl cooks for ml and cleans his home .
I couldn't find a bg novel that matches that description but I know of one that's shounen ai that's very similar. It's I Have Paid Too Much For This Home. Spoiler: Here's the summary Su Xingchen inherited a house where a rare spatial overlap occurred inside. The person who ‘cohabited’ with him was a young and handsome entrepreneurial elite. This president was very pitiful. Everyday, he didn’t eat well or sleep well, and even had nightmares at night. Since they happened to live ‘together,’ Su Xingchen also helped the other person cook and clean in passing. For example, when eating glutinous rice with chicken for breakfast, he shared some. When eating beef stew and cucumber salad for lunch, he shared some. When eating bitter melon scrambled eggs at night … Oh, don’t like bitter melon? Ok, have pork stir-fry with wood ear mushroom instead! One month later, Su Xingchen was pleased to discover that the president had been fattened up by him (don’t you think?)! However, what Su Xingchen thought was a mutually harmonious companionship, somehow turned him into the other person’s ‘white moonlight’ (unattainable love).
I found a story with the same kind of plot but, it's BL so I end up not reading it. It is perhaps the book?