I wanna watch a drama in which the main couple is like the second couple (Shou Hua and Du Yang Xi) from Perfect Match (minus the part where he tries to leave her and treats her coldly haha).

I thought they were really cute with how he called her 姐姐 and all that. Also, him begging her not to leave him (loved that lol). I want the ML to be at the FL's mercy basically. I also liked that she was really calm and smart.

Destined to Meet You (it's modern day but has the same vibes, imo. ML is younger than the FL, it's a contract vs. arranged marriage that turns into true love, and FL is calm and level headed)

Maybe (ML's father dislike ML and has another woman, ML deceived FL, ML at FL's mercy, FL is smart, calm, and brave)

Or (ML at FL's mercy, FL is smart, calm and outspoken, FL leaving ML for quite some time at one point):

"I want the ML to be at the FL's mercy basically."

Love it haha -- here are some dramas where the ML is so down bad that he's at the FL's mercy:

This list of mine has a good number of dramas that might fit what you're looking for, or this list of MLs might be useful to you also.