Singer Sunmi released a new digital single "Heart Burn" on June 29 after 10 months. It is an album that contains the story of a hot love in midsummer, and the title song "Heart Burn" is a song that contains the fever of love on a summer day. The other song, "Childhood," a song Sunmi wrote and participated in composing, is a song that tells the story of a pure and fresh love that anyone could have experienced.

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