This review contains spoiler.

I thought Yisoo's father was involved with the cult. I'm glad the cult leader knew the reality of his mother's death from another person. Yisoo's father has many chances to make up to Yisoo and become a better father, but he always ends up scolding Yisoo and making him feel shitty for whatever reason. It reminds me of when Yisoo confronted him about the truth of his mother's death. He could've apologised, but instead pushed the idea that Yisoo behaves like a child. Yes, Yisoo is childish, but that wasn't the point. He better mend their relationship before it's too late.