If you're looking for manga similar to Nichijousahan Bi - Beautiful Life, you might like these titles. All recommendations are made by Anime-Planet users like you!
Both are BL manga in which one of the main characters is a single father. Also, while the situations are different, in both manga one guy helps out the other guy and that leads them into falling in love. Only Serious About You is the better of the two in my opinion, but if you like cute BL manga you should check out both.