I Became the Younger Brother of the Obsessive Lunatic Gong

I woke up one day to find I had become the child of a prominent wealthy family. The problem is, that child is 'the younger brother who gets murdered by the obsessive yandere'. How to survive from the monster created by a tragic family history, the obsessive yandere...? Raise the older brother, who had a terrible childhood, well! Hyung, I'll live quietly. I'll even act cute. Let's get along well, okay? While taking care of him, who was like a lonely wolf, I even met the original work's pushover and helped raise his low self-esteem. I believed I had distorted the original story like that. "Doyeon, don't hate me too much. This house, these shackles... they're all to your taste, aren't ...