or maybe he was referring to how jaei tried to cover up for taeha? seems like in earlier chapters, jaei would never gave excuses regarding taeha's live but now he does. maybe that's why big daddy mentioned about jaei seeing someone.
from what i got feom doing my own translations way back, its either because the pronouns in korean are confusing for mtl translation,s or the translator didnt proofread, because the korean pronoun used could be he/she/you/they.
To show the emperor that someone was trying to poison/kill him. If she had just thrown it on the ground, there would be no evidence. It's a lose-win situation.
Cuz the Duke might reuse his powers on her again. Although the brainwashing is break he might redo it (he was just close by). She need to take fast action so the emperor would be wary.
look how they massacred my boy i want to laugh every time I see him now like who is this