Heart is the debut extended play of the South Korean girl group Fromis 9.

Both of them consist of the same six tracks, including the lead single, "To Heart".

[1] In January 2018, it was announced that Fromis 9 would debut with their first mini-album after the release of their pre-debut digital single, "Glass Shoes", released on November 30, 2017.

[2] The group held a special showcase to present the single "To Heart" on January 24, 2018, which was a live broadcast on Naver's V Live app.

[3] They held their debut stage on January 25, 2018 on Mnet's M Countdown.