HOLY. SHIT. THIS IS GOOD!!! I think this is the first time I’ve seen this kind of trope where the villainess (sister) became the supporter of the heroine. Gosh, filial love is the best
I feel bad for the hero. If only the mc can tell him about the possible future then maybe they can do something about it rather than being reckless. It’s normal to find another lover after years of being separated but pushing them away whilst he’s still young? Idk