Ten years ago, during the war among the kingdoms of Dayan, Xiyan, and Nanyue, Prince Murong Jinghe of Dayan, renowned for his combat skills, led the Weibei army to significant victories against Xiyan and reclaimed Qingzhou city.

However, on his return to court to receive rewards, all the civilians of Qingzhou were massacred and he was attacked by the common people who blamed him for the tragedy.

Mei Lin, an orphan of Qingzhou, swears to take revenge from Murong Jinghe and joins Shadow Works where she undergoes years of rigorous training to become an assassin.

Soon the master of Shadow Works assigns her first mission which is to assassinate Murong Jinghe.

Mei Lin enters the palace and waits for a chance to kill him not knowing that the one behind the Shadow Works is none other than Murong Jinghe himself.