Saijoeun Hyeongje

After an unwanted breakup, Ha-Won ends up living with his estranged stepbrother, Chae-Woon. Contrary to his worries, meeting his brother is not as awkward as he thought, and they gradually narrow the gap as they reminisce about their childhood. However, while Ha-Won lets his guard down, Chae-Woon explodes with a secret desire he has been secretly nurturing...

(Source: Mr.Blue, translated)