Quests are divided into different categories based on the type and entanglement with the protagonists:
1. Normal Quest: No direct entanglement with the protagonist
> Basic Quest
> Intermediate Quest
> Intermediate Chain Quest
> ??
2. Destiny Quest: Direct entanglement with the protagonist
> Basic Destiny Quest
> Intermediate Destiny Quest
> ??
3. Unique Quest: One of a kind, usually comes when the MC is in the midst of a major plot.
4. ??
Note: Certain conditions that significantly affect Ian can generate automatic quests. However, to unlock, he must use his Luck Points.
I posted this here just so readers won't get confused. Even if you don't remember them, it won't matter much. Happy reading!