In the year 1926, Mu Wan Qing brings her mom's ashes back to China burial. A chance encounter lets Mu Wan Qing, Tan Xuan Lin and Xu Guang Yao meet and befriend each other. In order to secure her foothold within the Mu family, Mu Wan Qing intentionally gets close to Xu Guang Yao and has his backing. Meanwhile, Tan Xuan Lin works alongside Mu Wan Qing to investigate an old case that is related to the Mu family. The three of them go through life-and-death struggles together, and eventually realize the importance of protecting the country in tumultuous times.