The series started with an intriguing premise. Kiew, the main character, is transported into the future where he connects with his now older friends and their kids that who are nominally the same age as he and become part of his new friendship group. The writers could have exploited more story potential. Kiew's old friends having matured beyond him could have provided some story moments. The changes in societal attitudes and technology could also have been used more.

Kiew is distraught to find out his mother's and best friend's fates that he thinks are due in part to his sudden disappearance and is determined, with the support of his older friends, to find a way back to make things right. In the meantime, he becomes more and more involved with the current generation of friends and starts a romantic relationship with one of them.
This could have been a fantastic story with him attempting to find a way back and slowly coming to the mature realisation that his future has to be in the present and not the past.

Ironically, any story involving fantasy and the supernatural can't be fantastical; it needs to have a plausible framework to make it work. Unfortunately the writers thought they could get away with breaking the time line constraints of time travel fiction and presented us with an unsatisfying ending.