If Gaokao.Love.100Days generated the same gross revenue on the Epic Games Store, 高考恋爱委员会 would keep approximately $1,373,030 - that's $376,302 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $50,868. Epic charges 0% on the first $1 million in annual per-app revenue and then 12% on the remaining amount. On GOG (30% cut), the developer would earn approximately $996,728.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.