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Thank you all.
So, I'm attaching the map and a test save file (only these 4 heroes are available). The map is a clean RPG in the style of "Jennifer's Dream Journey."
1. I haven't encountered any taverns. Diplomacy is available.
2. The enemy hero is initially locked between the White Gate passage and the tower, which requires you to kill that hero to pass.
3. I tried trapping him in the castle and locking myself in there as well... I tried all the main objective points in this area... everywhere there's cursed land.
Tomorrow I'll have more free time and will check all the points.
I don't know about the timings... I don't understand Chinese :)
There's one timing at the beginning, but it's easily overcome.