I Became the Female Lead with Sweet-Talking Tea

What should you do when you transmigrate into the most tragically doomed cannon-fodder female character? Obviously, use cheat powers to turn the tables and steal the show! And, while she’s at it, use sweet talk to successfully become the heroine. When they first meet, the male lead is proud and aloof, his gaze as cold as icy stars. Later... The man corners the woman trying to leave. “Why don’t you call me big brother anymore?” “Call me your good big brother, and I’ll dote on you.” He becomes an eccentric, insanely jealous man who only wants to keep her all to himself and claim her as his own! But when she makes a triumphant return, tears the trash to shreds, and takes the world by storm, someone is always quietly by her side. Do you like the sky? The sea? Do you like... me? I like you, just a little higher than the sky, a little bluer than the sea.