His Royal Highness, You Are My Stand-In!

For three years, Yun Youyou has been the Crown Prince's quiet, submissive stand-in. Unbeknownst to him, she's a hidden mech prodigy training to take back her Zerg-infested homeworld, battling a severe psychological illness that only his presence can alleviate. To her, the powerful, handsome Prince isn't a lover; he's a living antidote, a walking stability field that keeps her mind from shattering. She's not infatuated, she's strategically dependent, using his 'stand-in' for her own desperate quest for power and a cure. When the 'original' lover returns and His Royal Highness plans to dismiss her, Yun Youyou drops a bombshell: \"His Royal Highness, what we signed...isn't it a substitute contract?\" The Prince thought he was the master. He's about to realize he's been the unwitting \"stand-in\" all along.