I=Fantasy

Background
I=Fantasy is SeeU's fourth demo and her first song in production. The song sounds like many hit Korean pop songs from its time, with a strong beat and a treble synth that plays in the background. SeeU sings about everything around her being a part of her fantasy. The original upload by SBS Artech has reached over 300,000 views, though there are reprints that have reached over 1 million views.

Controversy
While I=Fantasy was met with generally positive reactions by new VOCALOID fans, older members of the fandom were skeptical of the realism demonstrated in I=Fantasy compared to the other demos, as well as the heavy autotuning which masked SeeU's actual voice. It was revealed through audio reduction that the song actually contained blended vocals from both SeeU and her voice provider, Dahee Kim. After the controversy was brought to light, SBS Artech released a demo featuring only SeeU's vocals.

Other media appearances
SeeU performed "I=Fantasy" alongside GLAM at KSF2012.