In what year was the album “Day By Day - Single ” released by チャン・グンソク (Jang Keun Suk)?

In what year was the album “Day By Day - Single ” released by チャン・グンソク (Jang Keun Suk)?: The album “Day By Day - Single ” was released in 2021 by チャン・グンソク (Jang Keun Suk), featuring 3 tracks.
What is the most successful song from the album “Day By Day - Single ” by チャン・グンソク (Jang Keun Suk)?: “Day by day” is the biggest hit from the album “Day By Day - Single ” by チャン・グンソク (Jang Keun Suk).

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