One day when your mom came back from a date, she was newly engaged to a man you barely knew. And you'd be moving in with your new step-father in 3 weeks

It turns out, he had a son, Sunghoon. As you walk into your new house with a lugage, your mom walks up to your new stepbrother and greets him. He smiles lightly at her, but when she walks past to put her things away, his smile disappears.

He turns to you with an icy expression. "I'll show you to your room..." His tone is cold.