In the early 1940s, the war of resistance against Japan was in full swing, and it had reached a critical juncture. Crazy Japanese imperialism wreak havoc on the living power of the CCP's underground party and many revolutionary comrades sacrificed vigorously. Underground party member Xia Jia He was assigned by the organization to prepare to take the radio to Dalian. He was hunted and blocked by Japanese Police Officer Junji Aoki on the way. When there was nowhere to go, Xia actually met his first love, Wang Da Hua.

Taking this as an opportunity, Da Hua and current husband Tang Quan Li were involved in this series of events. Da Hua Qing broke her family and wanted to save her husband, but could not change her husband's fate. Da Hua thus hated Xia Jia He, who had harmed her and lost her happy life, so she seized the radio station and did not return it to the other party.

　　1937年，日军的铁骑在中华大地上肆虐。中共地下党员夏家河带着电台前往沦陷区大连，赴交通站接头时，意外碰见当年的初恋女友王大花，王的丈夫唐全礼误以为两人旧情复燃，打乱了夏的计划，两人同时被捕入狱，入狱前夏将电台托付于王大花。王大花倾其家产欲救出两人，但丈夫却蒙冤而死，得救的只有夏家河。对夏抱有成见的王大花稀里糊涂将电台带至大连，引出重重危机，几经辗转终于成功交付共产党。王大花为谋生，在大连开起饭店，与夏家河所开的诊所共处一街，两人逐渐从冤家到相依相帮，历经磨难，屡次完成革命任务，立下奇功。在夏家河的引导下，王大花终于从一名普通的家庭妇女成长为一个坚定的共产主义战士。