The young killer Situ Chunyun (played by Chapman To) and the senior Xiyang (played by Xu Shaoxiong) were hired to come to Hong Kong from the mainland. Due to the leak of news, the two separated halfway and agreed to meet on the terrace of a building. Chunyun, who was penniless, did not wait for Xiyang, but waited for the cold current and severe cold, and finally fainted on the ground. The young screenwriter Zhuge Toujiu (played by Wang Zulan) who lived in the building found Chunyun. This kind-hearted but a little fussy little man took him back to his home and took good care of him. After waking up, Chunyun wanted to kill Toujiu several times to silence him, but the other party was so stubborn that he was full of love and even talked about the romantic and tragic love history with his wild girlfriend Xu Tianai (played by Fiona Sit), completely unaware of the danger. As time passed, the friendship between the killer and the screenwriter deepened. Chunyun's cold heart gradually melted, and Toujiu also learned to be strong and confident...