Jian Fan was originally an ordinary man, growing up in a hotel. He just wanted to study different cuisines, but made a great contribution by a strange combination of circumstances while he worked part time as the auxiliary police, thereby starting his professional career as a criminal police. However, ever since his first case, he found he was involved in the center of the city's evil. Everyone around him seemed to have some hidden secrets, and the truth of everything in front of him seemed to be covered layer by layer. And Jian Fan was like walking on the steel wire of the edge of the good and evil, with every step being confronted with the bottomless chasm. 简凡本是一名从小在饭店长大的普通人，只愿钻研菜色中的酸甜苦辣，却阴差阳错在兼任协警期间立下大功，就此开始了职业刑警生涯……然而从简凡参与的第一个案子开始，他就发现自己已经置身这座城市的罪恶旋涡，身边的每一个人仿佛都揣着不可告人的秘密，眼前的每一件事的真客似乎都被层层掩盖，而简凡便如同走在正邪边缘的钢丝线上，每一步都面临着万丈深渊……