Xiao Rou is a police.
She is caring and brave.
She's taking care of her grandmother who is suffering due to old age.
Xiao Rou caught her boyfriend cheating on her so they decided to break up.
She can't take being a police so she decided to quit and be the bodyguard of Xiaonuo/Renjie that later on be her friend.
Later on as the story progresses she will meet Xiao Yawei whom she hated the most.
an extended description!