I searched for the chorus title of "Transparent Oath" you want: Can we be together forever? Composer: Gao Zhihao (pianoboy) Arranger: Xiujie Lyricist: Xiujie Singer: Xiujie
After listening to it, I think this is the song you want.
At that time, I was looking for this song for a long time, and then asked a friend for help.
She told me that this song was uploaded by a member named "Sebastian His Sister" on the 5sing Music Base in 2010. Because there was no name at the time, the original song name was used "The Truth" That You Leave" and I have not registered as a musician, so many people can't find it. This should be the earliest version.
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But I later listened to some covers and it felt good. You can search for "I Wander in Time" on the 5sing music base Names, there are many.
Then this is a female version that I think is more pleasant to cover
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Hope it can help you