The entire story is written in the second person.
You transmigrate into the young lord of Sishue Mountain.
Your parents have disappeared without a trace, and you sit in the bridal chamber, trying to figure out how to escape your wedding.
Qi Helin, eldest son of the Qi family of Yanzhou, is a prodigy.
But you can't marry someone you've never even met!
So, on your wedding night, you tiptoe out of the bridal chamber and unexpectedly run into someone.
The Qi family's second young lady, Qi Huanling.
A soft, delicate voice drifts over: "Sister-in-law, where are you going?"
You don't want to talk to her. You turn to leave, but she calls you back.
"Are you unhappy with the marriage, sister-in-law?"
"My clan has also found me a match, but I don't want to marry. If you want to leave, take me with you. Otherwise, it may be hard for you to get out of Yanzhou alone."
You hesitate, but decide to take her along.
After leaving Yanzhou, you part ways. Later, you unexpectedly meet again, and travel together, growing closer by the day.
Qi Huanling is the first person you've met in this world, and your first friend.
Naturally, you become closer and closer, eating and practicing cultivation together, even lying in the same bed at night.
...And getting caught by Qi Helin, too.
The two sides face off, neither willing to yield.
"Sister-in-law and I have already consummated our marriage."
You: ? What do you mean, consummated... And whose voice was that?
You turn around and see Qi Huanling open his mouth and continue, "We slept in the same place last night."
His voice is as clear as if it had been steeped in a cold spring, but there is a hint of gentleness beneath it, and the final syllables linger slightly longer than usual, as if carrying a cool fragrance.
It's a somewhat familiar voice, but unmistakably a man's.
You: ? Holy shit, wait, how is she a guy!
*
Qi Helin and Qi Huanling are twin brothers.
On the day they were born, the heavens showed an unusual sign: one half of the sun shone as brightly as ever, while the other seemed swallowed up in darkness.
The Qi couple were worried, so they sought out sages at famous temples. They learned that the twins' fates were fraught with danger, and that their lives might be at risk unless something was done to change their destiny while they were young.
From then on, Qi Huanling was raised as a girl and forbidden from leaving the family home. He could only sit alone in the courtyard day after day, never once going beyond Yanzhou.
On his older brother's wedding night, he was sitting in the courtyard admiring the moon as usual when he suddenly spotted a sneaky, bright-red figure on the wall, trying to run away.
He looked closely, startled. "Sister-in-law?"
When Qi Huanling first met you, he smiled and said, "Only if you take me with you can you escape Yanzhou, with all its hidden mechanisms."
When Qi Huanling parted from you, he smiled and said, "I won't trouble you, sister-in-law, so please don't reveal my whereabouts to my family. Now that we've left the Qi family, let's go our separate ways and have nothing more to do with each other."
Later, Qi Huanling pinned you to the bed. Beneath his pink-and-green dress, his body was hard and strong. He smiled and said, "You married into the Qi family. To the outside world, you're my brother's wife; within the family, you eat and sleep with me. Others will simply say we're on good terms as sisters-in-law."
"My brother and I look alike. If we have a child someday, it won't matter."
"What do you think, sister-in-law?"
You, pinned down with no room to move: Do I even dare say no...?
Theme: Forge ahead bravely