Harmonize. Kill. Hide. Replace.
Yu Liang extracted four keywords from the Fairy Lady's words.
Based on these words, these are probably the four feasible ways to clear the game, and any of them can be considered to have resolved the fundamental mystery.
The Fairy Lady only emphasized the specifics of the first method, and quickly glossed over the others.
It's probably because the Fairy Lady herself is unsure how to perform them.
Undoubtedly, the method the Fairy Lady recommended to him was to harmonize the moon, because she likely chose this path herself, and having Yu Liang join would double the efficiency.
From the perspective of difficulty, harmonizing is the simplest, because it is the only method that "faces" the player, while the others all require facing the moon- the source of the mystery directly, and their difficulty levels are not at all comparable.
The importance of each immediately becomes apparent.
