LIKES:
Concept of the secret passage way.
The house where the 4 guys lived was a nice set; modern and playful
Chemistry between the 4 guys and the female leads was decent.
Wardrobe was appropriate and some pieces were current street fashion.
FX for the VR and what was used for Xu Nian in the final episode was decent.


DISLIKES:
Writing:
They stole the eye glasses + AI + real guy concept from Holo My Love. Some ideas seem to also come from Cinderella and the Four Knights 2016 (4 guys, one rich house, one girl changes them all).
The “bad guy” was over the top, especially with his punishments, to the point of being ridiculous.
Very childish in terms of the romance, but is suitable for ages 10 and up. Also the “surprising reveal” in Ep. 35, was so predictable right from the start.

Production:
Green screen very obvious during car driving scenes and hot air balloon moments.
Pacing issues, even though the episodes weren’t too long, certain parts were dragged out for too many episodes.
Zooming in too close (I hate seeing up people’s noses) that the actor/actress head is cut off.

Music:
Sometimes too loud and you couldn’t hear the actor/actress voices (thankfully it has sub titles). Also some songs were terrible and I muted them.

OVERALL:
This was a child friendly sci-fi that really wasn’t a new concept in any way. If you liked this kind of genre watch Holo My Love (2020 S. Korean drama) I would recommend that over this. I won’t watch this again.