The Republic of China was in turmoil, and the mountains and rivers were broken. At that time, Shanghai was a bustling city with people coming and going just for fun. During the Republic of China, the Ruan family had twin sisters. The younger sister was born with a blue birthmark. "I thought everything was getting better and the birthmark was just an accident, but I found the answer when my sister went missing when she was four years old. It turns out that I can't escape. It turns out that this is all destiny."
Concept: Two sides of human nature