Xiao-Yi was raised by her wretched father after her mother left. Her father committed suicide and gambling debts. Ji grew up without parents and lived a lonely and desperate life until he finds happiness in the love of Xiao-Yi. However, Xiao-Yi was accused of killing her boss and soon sent to prison. Seeing the woman he loved arrested and charged with murder, Ji was unable to change anything.
In the prison, Xiao-Yi gradually established friendship with Qin in order to fight against the vicious power of Scar and Da-Li, the brutal "Big Sisters". Nonetheless, Xiao-Yi soon discovered that in this violent world, things weren't always what they seemed. When Da-Li’s participation in the drug trade was discovered by Qin, the fragile balance in the prison was threatened. Their sisterhood was tested and their loyalty was questioned.
Can Xiao- Yi put her past behind her and begin a new life with Ji afterward? Can Ji’s love prevail even if it comes to the worst?