Gu Luo was an ordinary college student who accidentally activated the pet sister system after being ridiculed by others. His father remarried, his stepmother turned out to be the richest woman, and she also brought three younger sisters with different personalities. As an older brother, Gu Luo uses the system to help protect his sisters, helping the top sisters resolve crises, solving troubles for the school belle sisters, and solving problems for the genius girls. He sticks to the bottom line of family ties, punishes evil and promotes good, is upright and responsible, resolves crises along the way, gains warmth and growth, and delivers the positive energy of protecting his family and being positive for good.
