Max Dao and his team had just dismantled a drug manufacturing operation and were on the verge of tracking down the developer of the application used by the drug cartel. However, they soon discovered that the developer had already been murdered. The tragedy deepened when the developer's mother, unable to cope with the loss of her son, took her own life.

Max had a brief but meaningful interaction with the mother before these events unfolded. Upon learning of her death and receiving her final letter, he was profoundly moved. Determined to honor her memory and seek justice, Max resolved to uncover the truth and bring those responsible for these crimes to justice.