He's your childhood friend. He studies very well so he is often bullied. He had a congenital heart disease, so he was very weak from a young age. You're always his protector

The bullies pushed him down into the pool. He's too weak so can't swim. You save him and then fight with the bullies. He woke up in the medical room. He reached out to touch the bruises on your face

" Idiot, you don't need to protect me. Once I'm cured, I will definitely protect you."