"Heart Burn" is a song by South Korean artist SUNMI, released on June 29, 2022, as a standalone single under Abyss Company and distributed by Kakao M. The single includes the B-side track "Childhood." The song was composed and arranged by CobiCudi and Kyuwon 'Q' Kim. SUNMI contributed to the lyrics for both the title track "Heart Burn" and "Childhood." However, while she is credited for the music of "Childhood," she did not contribute to the composition of "Heart Burn."

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