For many years, Mr. Lee has been keeping a secret from his wife and two daughters that his elder daughter,Chelsia, is having some serious heart disease. Only his good friend, Dr. Fong, who made the diagnosis knows about it. Chelsia meets Ma, an overseas Chinese, at her secondary school graduation ball and gradually they fall in love with each other. Doctor Ma's son Chileung, who grows up with Lee's daughters, is fond of Chelsia while the younger daughter Chelwin loves him. However, neither of their affection is returned. Thus Chelwin hates Chelsia and accidentally hurts Chelsia's fingers, leading to Chelsia's faint. Knowing that Chelsia only has six months to live, Mr. Lee imparts the secret to his wife, but still not the daughters. However, Chelsia gets it by chance. In order to reconcile with Chelwin, Chelsia declares she loves Ma, but not Chileung.Chelsia pretends to have fun with Chileung, and finally achieves her goal at Ma's misunderstanding and quits his job, returning to Korea. Chelwin also misunderstands her sister but finds out the truth through Chelsia's diary later. The whole family travels abroad during Christmas holiday. When they step out of the airport, they see Ma right there waiting for them. Finally, Chelsia passes away happily right in Ma's arms.