In ancient times, Korea was the first to make locks, with Ziwu Mandarin Duck Lock, Duiding Plum Blossom Lock and Heaven and Earth Qiankun Lock as the three highest realms. However, the ultimate secret of lock making is a unique skill that has been lost in ancient times - Hidden Dragon Gate.
The historical events that appear in this book are all set for plot needs and have nothing to do with reality, so please read with caution.
