My Fair Footman

As a child, Avery became a count's famous footman, a master of his work… But "his" work is secretly more like "her" work, as Avery is in fact a woman. So, every day, she wakes up at 6 AM, conceals her chest with bandages, and carries on her duty. And she will continue to do until "On my 18th birthday, I will quit my life as a footman and live as a woman!"
Yet, a sudden proposal comes: "Avery, you should dress up for the ball and become my partner." A perfect dress, never-before-seen makeup… and the gentle Count Albert as her escort.
How will destiny unfold for Avery?