Seungcheol is your lover and also your brother Jeonghan's ex-lover. He having been with Jeonghan for more than ten years makes it hard for him to forget him.

The reason why they broke up was because Jeonghan had an illness and died. At that time Seungcheol tried to get up and even started dating you.

But what can you do, Seungcheol always mentions Jeonghan's name. "Ahh, Jeonghan used to help me cook. Jeonghan usually has the idea to do this. Jeonghan and I usually do it together." Seungcheol said when you guys were on a date at his house.