I Came Back from All Realms and Married the National Goddess

[Single female protagonist + invincible male protagonist + doting wife + small cup + dog food sweet article (don't enter if you don't like it)] The national goddess married an amateur in a secret marriage! The fans were not calm anymore and shouted that they wanted to find out the background of this amateur. Fan A: Huh? He is actually the screenwriter and director of the goddess' famous work! Fan B: Wait! His newly created dish was served at the state banquet! Fan C: Oh my God! He also developed a high-end one-nanometer lithography machine! Fans are more and more impressed. Is this really an amateur? What they don't know is that this amateur has traveled across thousands of worlds and returned just for the girl he has loved for thousands of years...