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But in the trailer it shows her running with Gu Jiu Si riding with her on the back of the horse.

And In fact, the character Sheng Ming, played by Lin Xin Zé, is also a general.

Yes, he is the general's son. This is told by readers of the novel.

When writers write this type of character (and specifically here in this book), it's not a true villain. It's a character on a fine line between hero and villain. Perhaps in life there are people on that threshold (some will give themselves up completely to villainy, others will turn back and go in another direction.)
PS: As I read the excerpts referring to this character specifically taken from the book by fans of the book. I know that as to this character this description I have given is correct.
PS: And this character is an alter ego. One face in the mirror and the male lead is the other side of what he could have been.

The drama is celebrating this cultural date

youku
9 minutes behind Weibo Web
#Flower Order# In the middle of summer, rice balls can be tasted. One thought, one wish, Dragon Boat Festival. Starring @鞠婧祎 @Mr_ Liu Xueyi, "Flower Order" Youku is streamed exclusively on Youku, look forward to it~ Please poke for an appointment 👉Web Link

The drama is celebrating this cultural date.

youku
9 minutes behind Weibo Web
#Flower Order# In the middle of summer, rice balls can be tasted. One thought, one wish, Dragon Boat Festival. Starring @鞠婧祎 @Mr_ Liu Xueyi, "Flower Order" Youku is streamed exclusively on Youku, look forward to it~ Please poke for an appointment 👉Web Link

The drama is celebrating this cultural date.

Hanama Ling Guan Wei
14 minutes ago by TV series Hanama Reichao
#Flower Order# Listen to the wind in summer, sailing in Duanyang. Dragon Boat Solstice, pray for good health.

Hanama Ling Guan Wei
14 minutes ago by TV series Hanama Reichao
#Flower Order# Listen to the wind in summer, sailing in Duanyang. Dragon Boat Solstice, pray for good health.

Dragon Boat Festival - official poster

Luo Zi Shang and Liu Yu Ru:
https://weibo.com/tv/show/1034:4915179549294622?from=old_pc_videoshow

I don't know, as I haven't read the novel completely, but... I dug up this comment from fans who have read the book. From the little I've read, I only remember two young people who die (one on the antagonist side, and the other on the protagonist side), but I don't think it's now.

An illegitimate son of the Luo family. But there's so much more.

You went in an unexpected direction. I thought you were going to say: Why didn't the mother accept her daughter's request? But, yes, to this other danger, because the clash between antagonistic sides will start strong now.

The element I find most unreasonable in this preview is a fragile woman dressed in her fine clothes about to arrive in the middle of a battle where her armed and armored husband is dragged by other men to the ground. What can she do in the middle of war? (I know, literarily it's very beautiful, but I want to see what plausible explanation (since this drama is not a fantasy of magical powers), that the episode will show for the usefulness of her presence at this moment.).

About preview 13- 14: What plausibility will they show in this scene?

Welcome. That you liked it makes me happy.

Liu Xue Yi appears in the episodes 4,7, 8, 10, 11 and 12.