From Superfan to Stepsister

When my mom announced her remarriage, I knew I would be getting a stepbrother. But to my surprise, it was my idol, the super famous model Noa! He has made a name for himself with his cold attitude, but for some reason, he is extremely nice to me! The number one model waking me up in the mornings, helping me with my homework... and even giving me the occasional hug?! What other wholesome antics can we expect from this mysterious idol?! (Source: MangaUP! Global)