"adoptive siblings aren't real siblings." yes i know, but didn't they consider themselves as siblings in the past chapter? (I forgot the exact chapter tho bt it is when they kicked out their aunt.) so idk if that can't be the reason of sibling relationship bt for me it is. and yes, they only consider themselves siblings for a year and only been together for 2 years, but didnt u guys consider the 'past-life life?'... Imagine the person you see as brother for more than 30+ years (cz as far as i remember she was 28 or 27 years old when she was abt to get married) will be your lovey lovey.
Anyway, i just wanna drop this comment cz y not xD bt i'll still continue reading this whoever the Male lead is tho i can feel the bumpy road leading to both mc's relationship n i wanna see that.