On meeting Madam Butterfly, Dan feels delighted and tells her that he will not mind her unfaithful act. However, Madam Butterfly refuses to join him and says that her days are numbered. She asks him to turn his love to Caw. Nevertheless, Dan cannot drive her out of his mind and accompanies her to seek medical help from Chi. Though under Chi's treatment, Madam Butterfly's health seems to get weaker and weaker. Feeling hopeless, Madam Butterfly even attempts to commit suicide but is saved by Chi. With Lung's help, Yuen's father revives his memory and recovers his sense. Reunited with his father, Yuen is determined to reform himself and strive to revive his family name. This delights the Princess who agrees to marry him. Lo Tso still wants to get rid of Dan and he makes use of Yu. In the end, Dan manages to defeat them.