First of all, you should distinguish the difference between detention permit and detention notice. The detention permit requires the suspect to sign and print in duplicate, one for the public security organ to handle the case and the other for the detention center. The detention notice is made in duplicate, one for the family of the detained criminal suspect, one for the public security organ handling the case and one for the family of the criminal suspect. The detention notice only tells you where the suspect is detained and what public security organ is holding him.

Whether you plead guilty or not is not determined by whether you sign a detention certificate or a detention notice. Other evidence is indeed sufficient, and you must be sentenced if you don't plead guilty; Moreover, there is only a confession, and there is no other evidence to support it. In the end, it cannot be sentenced.