Liu Chaoxiao had a twin sister also called Liu Xiuying, but died in an accident when they were both young.
It happened one night when they were both coming back from a birthday party. They were on the bridge when a truck drove over, hitting their car. The car stumbled until it almost fell off the bridge.
The most unfortunate thing that happened was that the car's window at Liu Xiuying's side broke and because of how the car stumbled, she fell out of the car, falling into the river.
After Liu Chaoxiao was rescued, Liu Xiuying was nowhere to be found. The twins' parents did their best to find Liu Xiuying, even if it was her dead body, but to no avail.
It made the young Liu Chaoxiao devastated and depressed for months until he met Mo Yanlin, who became his best friend.
This current Liu Xiuying didn't have any resemblance to the Young Liu Xiuying, Liu Chaoxiao's twin sister, so it made Liu Chaoxiao think he was just imagining things.
