SEE ALSO: HEYNE is sweet and lovely as ever singing 'My Heart' in comeback MV

This making-of clip takes you through her album photo shoot, music video filming, and free time on set. The original MV features a romantic theme with HEYNE in different locations, holding up placards just to send a message to a special someone.

As previously mentioned, the emotional and expressive ballad "My Heart" portrays the feelings of an innocent young girl who has fallen head over heels in love, made even lovelier and powerful with the help of the orchestra. The lyrics were written by Wheesung and Noh Young Joo, while the song was composed by Shin Yong Jun and Noh Young Joo.

Check out the making-of above!