LI TUNG YI swears to take vengeance for his colleague who works as a spy beside the smuggler - HAU KWAN. At the same time he has to protect the only witness TONG - a nun.

TONG has firm belief in God and is an optimistic and kind girl. She is not frightened by the killer. However she does not want the church to be affected, she accepts TUNG to protect her.

TUNG is leading a care-free life which is a polar opposite of the strict one of TONG. This makes them have quarrels. On the other hand, TUNG admired MIMI, who is a PR, but she is only a troubler-maker. This confuses TUNG. Being affected by alcohol, TUNG humiliates TONG but TONG does not scold him. In fact she has more understanding of his heart. TUNG feels guilty and brings her to see the wonderful world. They have developed friendship.

Being betrayed by his boss, TUNG and TONG are found by KWAN. TUNG is shot and he recovers with TONG's unceasing care……