FL is NTR:ed by the ML

Any drama where the FL is basically stolen by the ML? 

I remember watching a Taiwanese drama where the FL had a crush on a guy but then the bad ML interrupted her happy crush and basically stole her from him. Then they became stepsiblings and a bit of useless anxiety about that and in the end he went living with his mommy which imo was kinda silly, but I liked the plot anyhow lol. So something similar to it.