A young man was abandoned in Temple Street when born, someone found him who was raised by twelve foster parents from the underground world that's why he is nicknamed The Twelfth Young Master. He meets a missionary called Teresa when she is preaching in Temple Street. He falls in love with her at once. However, they are from two different ends of evil and purity. The young man cannot help but has to make a choice between true love for Teresa and strong feelings for Temple Street.