So, all I remembered is that the MC has blue hair and he's a mermaid(???) I think so because the illustration has a chibi mermaid with blue hair and I think he was sitting on top of a rock So the MC is an actor (I'm not sure, all I remember is that he's working in the entertainment industry), I don't remember if he's a newbie or something. His father, the one who gave birth to him, is also a mermaid. Their distinctive features were their tail and blue hair, I think He had another father (the ex-husband of his Papa?? I remembered something in the past made them separate)who was very powerful, rich, and had many influence. He also had a brother and grandfather who wanted to spoil him. The ML was a typical cold, powerful, but surprisingly gentle and doting to the MC. I think he's friends with MC's brother. He's familiar with MC's family I think the setting took place in an interstellar futuristic setting Also I remembered that the MC didn't know he had another father. Because his Papa (the mermaid one) didn't tell him. If anyone found out the title, please let me know Thanks!!!