Became the Daughter-in-law of a Famous Martial Arts Family

One morning, I woke up in a strange world.
“Of all places to end up through dimensional travel… why did it have to be a wuxia world?”
All I knew about this place was that martial artists here shout out their cringeworthy nicknames before performing flashy moves. Struggling to survive in this unfamiliar and harsh world, I happened to stumble upon a mysterious gem.
“He said he couldn’t promise me anything. That’s why he never told me his name or title. All he did was give me this pearl and ask me to remember our bond.”
Thinking it was a good chance to make money, I fabricated a touching story around the gem and sold it for a hefty price.
Exactly a week into enjoying my new life with a pile of cash, someone came looking for me.
“I hear you pawned this Night-Luminescent Pearl.”
“Y-yes?”
“You claimed it was a token from your beloved, didn’t you?”
“Who… who are you?”
“This pearl is the heirloom of our noble house. It belonged to our eldest son who disappeared five years ago.”
“…!”
“You’ll need to come with me.”
Damn it. I’m screwed.
Turns out the heir wasn’t dead after all. Worse, he found out I lied—and now he’s blackmailing me.
“You will help me uncover the one who orchestrated my attempted mu*der.”
“I-I can’t do that!”
“You have only two options: die here and take your secrets with you, or cooperate.”
With no choice, I was forced to pose as his fiancée… but I can’t figure out what’s going on in his head.
“Why are you being so nice to me?”
“You’re quite the handful. When I act cold, you cry and say I’m too harsh. When I’m kind for once, you bombard me with suspicious questions.”
No… It’s just that you’re making my heart flutter.
Get it together, Gaenari. Your only goal is to finish this fake fiancée act, collect the fat reward, and live a carefree life. Nothing more!