In what year was the album “孤城” released by 洛先生?

In what year was the album “孤城” released by 洛先生?: The album “孤城” was released in 2021 by 洛先生, featuring 4 tracks.
What is the most successful song from the album “孤城” by 洛先生?: “孤城” is the biggest hit from the album “孤城” by 洛先生.

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