After Being Banished to the Cold Palace, I Got a Happy Ending with the Enemy Nation's Divine General

This novel's blurb:

Jiang Ruan transmigrates into the imperial harem of an unknown dynasty to take part in the imperial selection. On the night she is summoned to the emperor's bedchamber, he accuses her of deceiving the throne and sends her to the Cold Palace.

On her nth day in ancient times, she teams up with a young servant who delivers meals to the Cold Palace, selling cosmetics and making a fortune. Then the tyrant emperor wrecks her business and makes the boy disappear.

One day, chaos suddenly breaks out inside the palace. The enemy nation has invaded, and she immediately packs up and makes a run for it.

After escaping the palace amid the chaos, she unexpectedly runs into the tyrant emperor on the street. She saves him out of basic humanity, but he shamelessly clings to her afterward?

With a deadweight in tow and an enemy nation's legendary general hot on their heels, she tries every trick in the book, yet still can't shake him. Just as she's considering selling off the tyrant emperor, the enemy general suddenly pulls her into his arms.

Jiang Ruan: ???

After getting to know him, she decides to exploit his feelings and win him over so he can restore the tyrant emperor to the throne. But when he risks his life to save her from danger, her heart wavers.

One call of "Sister" unlocks memories sealed away for nearly three years. The somewhat unfamiliar face before her turns out to be the same boy who used to bring her meals in the Cold Palace.

Help! What do you do when you've saved the wrong person?

Reading Guide:

1. One-on-one romance, happy ending, sweet romance

2. Fictional setting, don't overthink it

Theme: Keep striving and never give up