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 looks at her,then your mom says “pack your things we’re going to the beach for some weeks” Timeskip you arrived at the hotel at the beach and (Btw sunghoon is 21 years old and you are 12)