As always, Stellar's MVs include imagery that relates back to their infamy and/or Marionette. A love song at first glance, but the words were chosen specifically.
Sting was represented here through the clicks and tacs. This relates to how they took the internet by storm with their outrageous concepts and how they received a lot of attention. (an allusion to Fool).
Also, the mirrors play an important symbol here. In Vibrato, the girls experienced a mirror scene which described their own horror and fascination of what they became: simply marionettes controlled in a box (the industry). Now when they see their reflection, it's more of an acceptance: the mirror is smaller, making them feel less trapped and they now have more freedom. Due to the attention Vibrato has given them, they now have more freedom to pursue concepts they're more comfortable with.
Also, there are Sleeping Beauty allusions here-- the cactus being the spindle and them reaching to touch the cactus is similar to how Sleeping Beauty touched the spindle in a trance. The blank expressions Gayoung gave made the trance, Jeonyul had the age of Sleeping Beauty, Hyoeun had the status of her and Minhee reached out to the campus (this part may need editing and more rewatching).
The dance of what we saw shows them grabbing their shirts, almost as if they're in agony. This represents both the agony of falling in love and the feeling of guilt they received after the hatestorm that was brewed up after their releases. The point dance is very fitting. Having saw the dance practice already, it's a fun choreo, probably one of their best.
Dance practice on http://www.melon.com/musicstory/inform.htm?mstorySeq=3190&startIndex=0&musicToday=Y