Let's we all confuse together. Many plot holes and noob writing. Drama would have been better if they put some reality after every plot feel like FL know everything and 10 steps ahead and never trust ML in her planning and expert in reviving dead people :). In first episode ML looks strong but later in every plot they make him fool. and feel likes backup tool for FL. Fifth sister did evil and schemed so much but in the end they turned every sister good. 6th sister was like child even her death plot was fake. even after knowing everything she still didn't kick any villain out of the house. Romance feel one sided like they need man just for offspring. in the last even Grandmother's thought, anger, punishment turn out to be fake. Even after 30 episode ML went for capital and even after month FL didn't think about him. even till last she wants to leave him. would have been better if they didn't add duke plot felt like different drama . and FL showing emperor seal to do anything she wants everytime.
Also sleeping with him before trying to steal the thing was incredibly cruel..she had chances to tell him but…
I think she didn't tell him because she didn't want him to break his promise to his master about that medicine. and This became my best Cdrama of 2025.