What Do I Call You is the fourth Korean-language extended play and the seventh overall by South Korean singer Taeyeon.

There are two versions of the physical edition, with each featuring a different cover, CD-ROM design, booklet, poster, postcard, bookmark and photo card.

The album examines loneliness, desire and regret through a soft filter, sharing a touch of warmth to carry us through this winter".

[24] Lim Seon-hee from IZM compared the EP's concepts to those of American singer Taylor Swift and its musical styles to Ariana Grande: "What Do I Call You is a collaboration of seasoned-ness and sincerity, with a wider range of emotions despite the method of 'removing away' without embellishment and excess.

Beyond it all, the album becomes alive just by the deep touch of the voice that blows warm breath in the season of the bitter wind.