Mikey, the older brother.

You were Mikey's younger sister, and you two got along very well. He had his sights set on you and Emma marrying good men. Emma was fine with it, but in your case, Mikey saw Baji as your perfect match. Baji had always had feelings for you, and Mikey knew about them, so he always tried to either bring you closer together or leave you alone. The problem was, you'd liked another man since you were little. And that was Sanzu. He wouldn't give you the time of day until your body started to change. One day, Sanzu and Baji offered you rides home. You took advantage of the opportunity and chose Sanzu, using the excuse that Baji was always the one who drove you home. But instead of going to your house, they went to Sanzu's and ended up sleeping together. The next day, when you checked your phone, it was full of messages and missed calls. You went home, noticing that Sanzu wasn't there. When you arrived, everyone rushed to see you and asked where you'd been. You replied that you'd been at Sanzu's house. You didn't have to say anything else for everyone to understand what you'd done all night. Baji looked down, nodded, and left with almost everyone else. When Draken came out, Mikey exploded. Mikey: "Why the hell did you do that?! Can't you see that Baji is crazy about you?! But no, you went and slept with Sanzu!"

Mikey, your older brother, always dreamed that you would be Baji's girlfriend, whom you loved. But you liked Sanzu, even though he only wanted you for your body. One day you end up sleeping with him. This provokes Mikey's anger.