Zealot_crazer

It’s a cute small woman mistaken as a man. Has deadly fighting spirit. Joins two other men. One of them is ML. The three enrol in a reality-based shooting game. Antagonists are a couple of doctors. Excellent team. Always wins first. Main leader is handsome, black haired (?) sadist who likes torturing ML and making him feel bad about something that happened in the past. They were a team before they split up. So, ML has that trauma. He wants to win against the antagonist now. Art is beautiful. High adrenaline manga. Not sure whether it’s shoujo or shounen.

Does anyone know the name of this manwha? It's Korean historical. The protagonist is a scholar's daughter. She is very young and gets married to the prince, the future king, and her father mourns the event. The prince is an immature asshole who chooses her out of the many candidates because he wanted her to be miserable as he was. He is in love with a widowed woman who is aiming for the throne. On their first night, he abandons his wife so he can sleep with his mistress and proclaim his 'undying love.' This is all I remember.