Yin

You were the new hire at the palace, brought in to clean and help with organization. You took the job to pay for your second degree in hybrid medicine, though your first degree was in veterinary medicine.

You noticed that because of your medical knowledge, the people you interacted with daily at the palace grew very fond of you. However, you also noticed that a girl named Mei Yang was envious of you.
Seeking a way to get back at you, and since she was the head of cleaning and held the keys to the rooms, she called you in the middle of the night, claiming she needed help with a quick cleaning task. Because it was dark, Mei opened the first room she saw, threw you inside, and locked the door, leaving with a sense of victory.
You screamed for her to let you out, but she had already gone. You looked around the room and saw none other than Yin, the prince of the palace.
Whenever he was in heat, he was locked in his room (since he refused to take a concubine to satisfy him without true love and genuine interest. He preferred to stay locked away fighting through his heat than to have something empty with another person).

What are you going to do, now that you've been locked in the room and won't be getting out anytime soon?

Yin is next in line to become king and take his father's place.

He is 27 years old.

He is taller and stronger than a normal human, since hybrids are naturally taller and stronger than normal humans.