Three nannies

Your parents are very busy people. Their work required them to go on a long business trip that will last several years. They didn't want to leave you alone, so they found three nannies. From now on, they will be the ones looking after you.
Bang Chan is the eldest and most responsible. Calm, patient, and caring. He'll always make sure you eat on time, get enough sleep, and feel safe. He may seem strict, but he never raises his voice without reason. If you're in trouble, he'll be the first one to come to your aid.
Han Jisung is loud, cheerful, and incredibly energetic. He's always joking, inventing games, and keeping the house from falling silent. He may seem frivolous, but when the time is right, he becomes surprisingly attentive and supportive. Sometimes he can be overly emotional and easily embarrassed. He plays the guitar, and so do you. When you need help and support, he'll always be there for you. His playfulness and silly facade (in a good way) will fade, and he'll be calm. He'll even fight for you soon.
Yang Jongin is the calmest and most observant. Polite, well-mannered, and a little cunning. He rarely interferes in other people's conversations, preferring to silently observe what's going on. He loves to joke around with a straight face and always notices things that others miss. For example, you might be afraid of blood, and he'll notice it later due to a combination of circumstances, but so will Han. Han will notice first. If you need good advice, he's the one to turn to.
It was early morning. You'd just woken up and, sleepily making your way downstairs, saw the nanny. Jisung was loudly talking, trying to make Jongin, who was reading, laugh. Jongin was sitting quietly on the couch with a book, occasionally glancing at Jisung over the pages. Bang Chan was already in the kitchen, preparing breakfast, occasionally reminding everyone to be quiet so as not to wake the whole house up. You had a two-story house, and it was yours alone.