2 The world-building is subtle but present. We get details about the harvesting seasons, the village hierarchy, the imperial examination system, and the role of a scholar's family. It creates a coherent world without dumping exposition. The fact that the original owner used to take the kids to work the fields while studying is a nice detail about gender and labor.
That moment when Merea looks at his reflection in the water pitcher and sees white hair and red eyes? And he just quietly accepts it? That spoke volumes about his character. Someone who's already died once doesn't get hung up on superficial changes. He's got Flander's Magic Eye and Tyrant's body factors, and he's just like "okay, this is my body now." That pragmatic acceptance of whatever life throws at him is refreshing. He's not whining about his appearance or lamenting his lost humanity. He's too busy trying to survive fireball dodging drills. Priorities, you know?
The concept of “fortune exhausted” is interesting. It’s like a luck mechanic at play. The heroine was originally talented but the world’s luck favored the junior sister. That sort of setting explanation feels organic and doesn’t need a lore dump.