During her long journey to a foreign land for her dream marriage, Princess Yan (Charlene Choi) finds herself falling in love with General Cheng (Raymond Lam) who is leading the military escort. Regardless of their forbidden love, they exchange love tokens. However a sudden attack by a bandit gang changes their destiny. General Cheng was taken hostage by the female leader of the bandits, Zhu (Joey Yung) and he gradually falls in love with her. Drama continues to unfold as Cheng is faced with tough decisions.

The story starts because of one journey. Seven people who have never met before climb aboard the same ride that goes into a seemingly endless tunnel. Despite the countless trials, corpses that mysteriously appear, past acquaintances that returned from the dead and an unseen danger threatening to swallow them whole, it's as if they are trapped in an enclosed space where there is no escape.