Can I sue him for fraud with such an iou?

First, you can't accuse him of fraud;

Second, you can bring a lawsuit to the civil division of the court;

Third, the target of1.20,000 is not small, but it is not small. I suggest you bring a lawsuit to the court as soon as possible to safeguard your rights and interests;

4. Also recommend Hunan Haichuan (the third in the province) Law Firm, Lawyer Luo, 50 1 84426 108 84427 108, Block C, Good City Garden, Shaoshan North Road, Changsha.

Brief introduction of lawyer Luo:

Director of Civil and Commercial Department of Haichuan Institute; Member of Civil and Commercial Professional Committee of Provincial Lawyers Association; Letters and Calls Reception Lawyer of Provincial Letters and Calls Bureau; Arbitrator of Changsha Arbitration Commission; Computer News-Hunan Changsha Passenger Transport Group, Hunan Longxiang Bus, China Dida Insurance Hunan Branch.

Please call for details.

I hope my answer is helpful to you.