Thank you all for your continued support. This time, I would like to briefly explain the TDR shot lining system. This method was developed as a secondary lining construction system for shield steel segment sections. The advantages are as follows: 1. It can accommodate all types of sharp curves due to the application of mortar. 2. The use of a continuous mixing system allows for faster construction speed. 3. It excels in cost-effectiveness and shortening construction periods. Additionally, we have three types of finishing materials available depending on the application of the shield tunnel. Next time, I would like to explain the materials used in this system. Thank you for reading up to this point.