He Lan's child is Gao Zhongqi's.

The Age of War, a period drama produced by Beijing Jiecheng Times Culture and Media Co. Qin Chengyu, the eldest son of Marshal Qin, is unwilling to take over his father's hegemony due to his strong aversion to killing. At the same time, he and Gao Zhongqi, the chief of staff of the Hanping Military Governor's Office, become acquainted with He Lan, a passionate, beautiful and righteous schoolgirl. He Lan and Gao Zhongqi fall in love with each other and give Gao a hibiscus brocade veil embroidered by her own hands as a token of their love.

Synopsis:

Gao Zhongqi takes out the piece of hibiscus brocade and reads out the words embroidered on it to Helan with his last bit of strength: "I will not be disappointed in this life, but I will not forget in the next. I will not forget it in the next life. This is his promise to Helan in this life, and also the promise of the next life. Gao Zhongqi's love for Helan was unswerving until death! Helan was grief-stricken.

A few years later, Helan brought Qin Chengyu and the grown-up Fu'er to the hibiscus tree that she and Gao Zhongqi had planted with their own hands. The hibiscus tree had grown much taller, the piece of hibiscus brocade was tied to it and fluttered in the wind, and the words on the brocade were still clear - not to be forgotten in this life? The next life will not forget!