The Main Brother's War: The Side Character's Temptation

This is a BL story. The protagonist, ahem, I mean the protagonist, who transmigrates and becomes a supporting male character, lives in a huge clan. He's a supporting character to the women who transmigrate into the story, a boy who turns dark for love. He has neither a prestigious identity nor power, and is used by the heroine. In the end, he becomes cannon fodder at the hands of the male leads, who are overwhelmingly powerful. (P.S. The heroine isn't a white lotus; she's an extremely ambitious woman.) But after transmigrating, he changes. He is no longer weak-willed, and the heroine is no longer the only thing he sees. "Gongye Lianzi (Asahina Xuelian), since you like them so much, I'll just take them from you one by one~ Heh heh."