In Jumin's route, Jumin reveals that he realised when he was younger that his father was kind to him, not because he wanted anything, but because he truly loved his son and that made Jumin want to become closer with his father; as a result, Jumin because increasingly unstable when his father attempts to force Jumin into marriage despite his protests.
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I just need one person to understand me.
Perhaps I'd forgotten about that.