Thank you for uploading a lecture that didn't exist before. However, there are many parts that verify the minimum unit function in the middle of the lecture. Quest, task that composes the quest, action and target that compose the task, questSystem that manages the quest, achievement that inherits the quest, etc. You have to assemble all the objects that the system needs to check whether it is actually implemented. The lecturer may have the big picture in his head, but from the perspective of the follower, you will get lost and only clone. In my opinion, it would have been a better lecture if you checked whether the taskGroup before the quest works well, excluding the achievement implementation.