When Swallows Return

“When the swallows return, I will be back.” That's the promise left by Prince Ngai Kim-wan (Wei Jianyun) when he leaves his pregnant wife Bak Lei-heung (Bai Lixiang). He is on a mission to ask for military support from the Eastern Qi in order to liberate his country, Western Liang. Princess San-wu (Shanhu) of the Eastern Qi has a crush on Kim-wan and forces him to be her husband in exchange for the support. Kim-wan refuses, stating he has a wife already. So, the princess sends assassin to kill his wife and child. Will they be able to escape the danger? Can Kim-wan finally liberate his country?