Su Jin, the princess of Dachu, was pushed into a dry well due to palace conspiracy. When she woke up, she found herself in the ice and snow of Changjin Lake in 1950. The collision between the modern battlefield to resist U. S. Aggression and aid Korea and the ancient soul caused Su Jin to awaken the "time and space sign-in system". Every time she signs in at a key place in Changjin Lake, she can obtain military supplies, weapon drawings, and even ancient military art inheritance. As a princess, she commanded the battle and used her wisdom to crush the enemy. At the same time, she discovered that there were shadows of ancient forces behind this war. From a lack of supplies to an armed corps, from being alone to being admired by thousands of people, Su Jin used the sign-in system and knowledge of modern warfare to write a heaven-defying legend across the ice. Core value: protect the homeland, redeem oneself, and finally establish immortal merit on the banks of Changjin Lake.
