He Is Actually a Childhood Sweetheart

Copywriting: Just let it go, I won't write in detail. Probably... Well, I thought they were rivals who disliked each other, but I didn't expect that they were actually sweethearts! I can't bear to think that my roommate is my older brother who looked like a dog when I was little. —— The speed is too fast, don't enter if you don't like it. Please forgive me. Concept: Easy to watch, cookie.