I know Siwoo will make a right choice. Do hyeok is just scumbag that cant repent his sins. If siwoo accept dohyeok he is also scumbag. How can he accept abuser and raper as his lover.
Until the end her brother keep being shitty brother.. You already leaves her once to battle on her own. Now he didnt even have hesitation to not attend her wedding and prioritize other ppl than his own blood, his sister.