The background music in the ending animation 1 is a shortened version (the part before 1 minute and 19 seconds) of "P35 (Falling Leaves Agarwood? Variation)" among the 105 pieces of music (PS: The track name is enclosed in brackets Indicates that the name has not yet been determined).

The background music in the ending animation 2 is the first part of "P96 Sword Soul Qinxin? Variation" (before 1 minute and 07 seconds) + "p93 Fengming Qishan? Variation" among the 105 pieces of music. The combination of the latter part (after 2 minutes and 04 seconds), "p93 Fengming Qishan? Variation" appeared in promotional animation 3.

The background music in the ending animation 3 is another version of "P28 (The Wind Blows the Branches)" among the 105 pieces of music (the most obvious difference is that the ending music adds flute elements and significantly longer).

The background music in the ending animation 4 (credits list) is "p86 Snow Nuan Qinglan", Qingxue's theme song, among the 105 music pieces.

The very sad piece of music should be the third piece of wind blowing the branches, it is the piece of music where Sister Weather is walking alone

See reference materials for the download address