Me and the scumbag

Bai Tong awoke from a car accident, and found that he was reborn as a 4 year old. In his previous life he was deceived by a scumbag, in this life he decides to stay away from scumbags! Only…who is this scumbag? Bai tong only has faint memories of his past life, and special pheromones. Can Bai Tong figure out the truth about his past life?