Assassination Begins With Gaining Favor as a Maid

He was the knight serving the Crown Prince.
She was the assassin sent by the Second Prince.
Trained from a young age, she never disobeyed the organization’s orders. Even if it meant being transformed into a woman to seduce the captain of the knights, she accepted it without complaint.
Disguised as a young maid, she infiltrated the home of that seemingly carefree knight.
“He must never find out who I really am,” she said.
“Better not alert her just yet, I’ll play along for now,” he said.
“To stabilize the situation, I should first gain his/her favor.” —They said in unison.