We could see many times in the flashbacks that In Na's eyes became blue just before the accident. And she was looking at her mother's eyes in the mirror. But they didn't reveal what thoughts she heard from her mom? Did they? Was it a suicide? I feel that there is a mystery because why would they show InNa using her power at that time?
omg WHY did they make him gain so much weight when they used the bodysuit for the sister ??https://mydramalist.com/article/although-i-am-not-a-hero-drops-stills-choi-kwang-rok-gains-30-kg-for-his-roleThis…
He was probably skinny to begin with and he's just a bit chubby now, not fat. The sister is obese so a bodysuit is mandatory and she probably will be back as slim by the end of the drama.