"Kang" and his three friends have become the shame of the Thai police ever since they made the headlines for being too fat to catch a robber. The four fat cops must lose the fat within three months or they will be punished! When the beautiful Zumba instructor "Xiao Min" joins, the training becomes exciting. However, the robberies continue to happen, and a bank armored car is robbed with heavy losses, but the criminals have not left any clues. The four detectives must investigate the crime while getting in shape, and the weight loss deadline is approaching, but the mystery of the crime remains unsolved. How can these oversized guys keep their jobs?