A carefully designed first encounter led to a fateful relationship in the troubled times of the Republic of China. Gu Qingyuan and Lu Zhichuan met under the shade of the parasol trees at National Sun Yat-sen University. One had a secret while the other had the world in mind. They talked about new culture, family and national affairs, and the sweet smell of sweet-scented osmanthus cake was the purest heartbeat of young girls. However, the current situation was turbulent and the war started. Lu Zhichuan went to Whampoa for his ideals and turned to the battlefield of defending his family and country. Gu Qingyuan was forcibly recruited by the Party Affairs Investigation Section, and he was frightened every step of the secret war without gunpowder. Time has cut off news, and smoke has blurred their faces. When they met again in the flames of war deep in the Taihang Mountains, their identities had long been separated, and their love had become a shackle. In the torrent of saving the nation, are they comrades fighting side by side, or tit-for-tat opponents? This secret love that began under the sycamore tree will eventually write their chapter before the dawn of the restoration of the mountains and rivers.
